Why not specialized frontends on a common backend? Common accounts for "inlu.st" and "solone.ly" or something, but with ability for activating/deactivating visi

Why not specialized frontends on a common backend? Common accounts for "inlu.st" and "solone.ly" or something, but with ability for activating/deactivating visibility on some domains. I think that both the and community requirements can be very different for casual contact and ltrs, but there will be some natural mobility between those.