You're on Balmung so you should know the futility of that question lol, end game for so many players is glamour, and with all the RP is pretty much a better looking Sim lol. Housing has the potential to be another glamour outlet (for those who have, may already be such), which would be much stronger if everyone could take part and allowed for greater customization (the double space capacity in 4.0 will help that obviously). Partly why I believe a WS system would do much better, since its been shown glamour is such a strong interest to the community - the creativity would be much stronger there (for player and SE). It is definitely not just Balmung asking all the glamour questions.
Also houses have the opportunity to be a really great group project for FC, if they were able to add more pertinent structures and facilities to their lots and interiors; however, there is significant issue preventing that now and that is not every FC can get a house which basically means houseless FC would be near trash, and in some people's eyes are already that way (unfortunately). If they didn't have a housing issue it we might more readily see interesting projects revolve around the FC (and differing types rather than "vehicle stuck in a side room, like airship, submarine, walker"), and make it less about glamour for both players and FC (adds another form of possible progression, and can also greatly help the market circulate). The restriction imo is leading to a lot of diminished results, not only people who want it (FC and player) but also in what SE could offer in the system because they have to assume their system doesn't meet demands and doing anything that literally locked others out would be silly (so you have to design around the issue, which limits the creativity and possibilities).
Although I just wanted to make sure you knew what I meant about the FC house thing, I wasn't telling you to get an alternate lol I was saying if I wanted to not lose my current house and assure I could get a new house (or at least not lose one) I wouldn't drop my house to the market and then buy it up again, losing many items, so I could then buy another house in the expansion area (as OP was sort of detailing). Instead I'd keep my current house and then buy a new house on an alt under FC ownership, so long as you have friends to help with some of the goofiness you could use it for all of its features and for your alts/main. Less wasted resources with the stipulation of friends lol.
An interesting result of allowing a player to share a house with ALTs and give them extra rooms would be you could have 8 rooms all with max planting pots. Not really that crazy but is a thing, also depending on what SE adds in the future may cause other issues to be designed around.