@Sim :blobfoxcomputer: :ferris:
How? By using your mastodon account to follow lemmy/kbin communities, and have a messy and subpar experience?
(Deliberately used the quote feature here.)

And the alternative would be to put the proverbial gun to Lemmy's chest and force them to adapt to Mastodon's "standards" for the convenience of Mastodon users?

If Mastodon can't handle threads and posts with over 500 characters as properly as just about everything else in the #Fediverse, the problem isn't on the side of #Lemmy or #kbin. It's on Mastodon's side.

Likewise, if Mastodon can't properly display quotes like the one above, and I've just demonstrated it can't, the problem is on Mastodon's side and not on the side of the many projects that do support quotes.

Mastodon users tend to demand the whole rest of the Fediverse cut down on its features so that it works better with Mastodon and justify it with Mastodon having magnitudes more users than everything else combined.

Also:
You can't use your credentials from instance X to login on instance Y, so if you want to correctly participate on lemmy/kbin, you need an account on one of these instances.
(Another quote which Mastodon can't display. Blame Mastodon. #Hubzilla here works perfectly well.)

To take Hubzilla as a different example: So you want to only log into hachyderm.io, then go to hub.netzgemeinde.eu and create a wiki or a long-form blog or a photo gallery or set up a cloud storage with WebDAV, CalDAV and CardDAV right away, all with your hachyderm.io login? Is that what you want?