I don't really know how the general community would feel about this. However, I have talked to a couple of people and they seemed to like it. So here is my toss into the suggestion pit.
I know the community wants better housing and at this point in time, we know that with how they have built housing it is almost impossible to recreate housing from the ground up. Besides adding new wards as I am sure this suggestion and want is screamed at the top of people lungs. I think homes and apartments should be able to have its interior expanded. This is mostly a suggestion for apartment owners but I didn't want to leave house owners out.
I figured it could be almost like a Tom Nook style system, where you pay so much to get an extension added on to your place. Where there is an option to have a balcony for apartments that face away from the main housing district to avoid having to code being able to see all the houses of that ward. The balcony could allow for more or larger planters.
This was just an idea of mine, please feel free to add on to the idea. I figured it would give some sort of relief for apartment owners to have more space to be creative and enjoy the housing system a bit more. Having limited housing in any game I have been in has always been a nightmare. I think at this point it's how can the developers make people feel like they have a decent home not so much how can every player have a home.