@Gargron I'm on a few Mastodon servers as a user, and I haven't looked for or noticed any changes of features, yet.
But - I haven't noticed anything - software dev to software dev - is fantastic: it means you've released a major change which is stable and consistent enough that I haven't noticed it as a user. As a dev who hasn't always successfully done that, well done. It's a sign of the quality of your testing and review.