BlueSilverRed

I get that there are different apis for Lemmy and Mastodon (and maybe Lemmy and kbin), but I’m interested to know why you can’t create a server that supports both/all apis. Even if it’s not possible to support the correct ui on a website, why am I not allowed to log into an app that would display all the ui correctly regardless of whether your account is from mastodon/lemmy/kbin.