There are no four-year old Model 3s...production didn’t start until mid-2017. Are you sure he has a Tesla?
My car is a Model S and the interior is fantastic.
Like so many times, buying a competitor is just not worth the trouble, especially when they think too much of their product.
Catch some of the Youtube videos of the new electric car assembly plants in Europe by Audi, BMW and Mercedes. It doesn’t look like they need any help or new technology injections. Their systems are all modular and designed for ease of manufacturing and modification. Looks like Tesla has not done a very good job of that. Sporty looking, sporty but not very stable.