Sheldon’s insistence on not having a dining table in his and Leonard’s apartment inThe Big Bang Theoryis due to a heartbreaking detail inYoung Sheldon. By the time Chuck Lorre and Bill Prady’s sitcom started in 2007,Jim Parsons and Johnny Galecki were already living with each other. It wasn’t until later that it was revealed how they became roommates, although subsequent details about their earlier years are still uncertain. Despite this, considering the pair’s shared interests both in terms of science and pop culture, they were able to reach a compromise on how to decorate their space.
WhenThe Big Bang Theoryended, Sheldon and Leonard’s living arrangements were already different. Leonard and Penny took over the bigger unit, while his best friend moved in with Amy across the hall. While Sheldon no longer lived there,Apartment 4A remained the same, as his friends considered his feelings over making changes in his former home. One thing that never changed was the lack of a dining table in the bigger unit — something that was always the case inThe Big Bang Theory. TheCooper family’s story inYoung Sheldon, however, reveals why Sheldon didn’t want it.

Young Sheldon’s Family Dinners Explain Sheldon’s Lack Of Table In TBBT
The Cooper Family Dinners Were A Staple In Sheldon’s Childhood
The Coopers' family dinners were an important aspect ofYoung Sheldon’s storytelling. They were a way to gather the family at the end of the day and ensure that everyone got to interact with each other. Admittedly, the dinners became less frequent as the show neared its end, primarily because the kids started developing their lives separate from the family. Georgie would spend time with Mandy, while Sheldon would stay overnight at school. Still, theCoopers' dinners were a staple of Sheldon’s childhood— something that ended with a major tragedy whenGeorge unexpectedly died.
the real reason why Sheldon didn’t want a dining table was because he didn’t want to remember his dinners at home.

This is likely the reason why Sheldon was keen on not having a dining table inThe Big Bang Theory. The matter was actually discussed in the nerd-centric sitcom when his friends brought up how much easier it would be for all of them to gather and share their weekly meals if they had a proper table. In any case, the unit already had a space for it near the window.Sheldon, however, insisted on not adding the furniture, explaining that he didn’t like change, and he wanted to keep their set-up on the couch.
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As it was usually for him, Sheldon did get his way. Everyone gave up trying to convince him. By then, it seemed like it was yet another mindless quirk for the character — something that he was known for.That said, upon seeingYoung Sheldon, which delved deep into the socially-inept genius' childhood, there’s a good chance that the real reason why Sheldon didn’t want a dining table was because he didn’t want to remember his dinners at home. While they were a great memory, the devastating loss of his father had made it difficult for him to remember.

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Despite his genius, Sheldon has always had an issue processing his emotions.This was further proven in theYoung Sheldonfinaleflashforward sequence, where he finally admits that George wasn’t a bad dad as he previously suggested.
Interestingly, however, he arrived at this conclusion even when he continued to believe that his father cheated on his mother —something thatYoung Sheldonseason 7 undid.

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That said, at the time ofThe Big Bang Theory,Sheldon’s refusal to get a dining table could be his coping mechanism for avoiding processing his conflicting feelings about his father.
Why Sheldon Was Okay Having A Dining Table When He Started Living With Amy
Sheldon Was Gradually Processing His Feelings From Childhood
Somehow, Sheldon’s reluctance to have a dining table seemingly went away when he started living with Amy. By then, the pair had been already dating for years, and after some ministrations on her part, she was finally able to convince her long-time boyfriend to move in with her in Penny’s old apartment. After getting used to the place,Sheldon and Amy regularly ate at the existing dining table in their flat, signaling the change in his outlook about having meals in a proper setting.
Towards the end of the nerd-centric sitcom, Sheldon had already mellowed on his stance about his father.
Similar to the reason whySheldon stopped knocking three times inThe Big Bang Theory,his shifting view about dining table was a representation of the character slowly processing his big emotions from his childhood experiences. Towards the end of the nerd-centric sitcom, Sheldon had already mellowed on his stance about his father. He admitted that he missed George during his wedding and even credited him for figuring out his Nobel-winning paper. It signified that he was gradually accepting what happened in his life inYoung Sheldonbefore moving to California.
Young Sheldon
Cast
A spinoff of the sitcom The Big Bang Theory, Young Sheldon follows the youth and coming-of-age of Sheldon Cooper during his childhood in Texas as he pursues science and academia. The show also follows his parents, siblings, and Mee-Maw, painting a picture of the world where Sheldon grew up.
The Big Bang Theory
The Big Bang Theory: This sitcom follows a group of socially awkward scientists and their interactions with each other and the people around them. Centered on physicists Sheldon and Leonard, the series humorously explores friendship, romance, and the quirks of life among an eclectic group of academics.