Apparently both this one and the Samsung one are selling well, so... Somebody does.

This has come and gone. Feature phones had their thin&light phase, too. And it suits the manufacturers because they're doing this work to make foldables anyway, so selling the thin candybar is a free side gig. Which is probably needed, because to riff on your point, what consumer wants to spend 2K on a bad tablet with a plastic screen that folds into a mediocre phone?