This is a minor and petty issue, but I think it would be great if Bethesda increased the size of the vaults by 1 room to the right. Basically this would let you have 3 rooms of three on each floor.

I don't think that would be the best idea because then you wouldn't

use the space under you or upgrade and expand your rooms as much, now would you?

???

Of course I would.

I agree. It's very annoying to have 3,3, & 2.

At first this bothered me until I realized the extra scrolling to the side didn't need to be happening so my next two vaults are only 3 and 3 all the way down I don't bother going all the way out to the side.

I just use those spaces for storage rooms. Makes more sense, if you think about it