As I said, they don't use them much in restaurants in Japan, probably because of the laundry bills.
BUT, now that I've played the game, I realize it doesn't have a non-kotatsu low table option either. I was surprised when I went into the izakaya and all the tables were the western-style ones that you sit on with chairs. What kind of izakaya is that ??? Every izakaya I've been too had short tables on tatami floors that you could sit on the floor with. They really need some low tables so that Sims could sit on the floor, and not just the heated kotatsu. s
In fact, they probably could just include a design option under the kotatsu that has the table and floor cushions, without the cover and heating element. Or they could make zabuton floor cushions, and an option to sit on the floor around coffee tables if you have zabuton.
