Hear me out: Mixed use lots.
Off the back of the For rent expansion pack, I've been building loads of different styles of flats (apartments) and have been building mostly European style ones which sometimes can have commercial buildings on the ground floor (Because who wants passersby looking in)
Wouldn't it be great gameplay if we could have mixed use lots? Like you could build a block, with a coffee shop, bar, florist, bakery, fashion studio, or some kind of food hall or something on the first floor and have your sims living in little flats upstairs. They could pick up a coffee and/or meet neighbours at the cafe before work, or might even own one of the businesses in the unit below. You could event keep the same leasing system for the commercial spaces for a bit of added gameplay.
At the moment, I basically keep building residential gyms... and did put a waffle stand on the street, but would love to have a functional shop!