Like, I don't see why #FOSS #UX should be excluded from whimsy and delight. One of the things I'm trying to incorperate into my FOSS projects is exactly that: a delightful user experience that people WANT to keep coming back for.
Why shouldn't we give people the ability to add cool banners and colors to their profiles? If it incresaes the network effect to a federated, FOSS chat apps advantage, then I think that's worth considering!