@jwildeboer In short: it requires a refactor of the whole message parsing & generation code. AP messages are HTML, so you need to transform this Markdown to HTML, safely and efficiently. But if the user then wants to edit their post, you need to show them the Markdown again.
Glitch SOC does it in a problematic way, and we explored alternatives without (yet) figuring out an obvious path for having it in Mastodon.
@renchap So is it a problem in the AP standard where @evan and friends might be able to help? @taschenorakel
@jwildeboer It does not have anything to do with ActivityPub, but with Mastodon's internals