There are 2 issues with our current bases:
1 Most of them are just too far from any pokecenter to convince any of your friends to follow you there.
Because of that most bases end up being attached to fortree.
2 They're too small.
The only layout where i managed to nicely put all my favourite stuff (stand, slide, snorlax doll, ragged desk, tire, christmas tree etc,) was the one with 3 rooms (tree).
Regardless, it would be nice to have a bit more variety (and some extra uses, but that's off topic)