Mastodon meta
My least favourite sharp edge of Mastodon is the fact that when you view someone else's post you only see replies to it that are known to your server - so there's actually a good chance there will be relies that are completely invivible to you, especially if you run your own instance
I'd love it if tapping a post kicked off a request back to the original server that fetched the current reply count, and provided a "view all replies" button if there were replies not yet visible to me
Mastodon meta
I have pointed out this for years and people keep saying it's not a problem or didn't understand it.
This is one of the reasons why we will abandon the ActivityPub protocol and replace it with @matrix instead (as it happened with OStatus replaced by ActivityPub).
Matrix has already solved all the problems of ActivityPub and did it for real-time communications, it will also be fine for social networks and many other things.
Matrix is true Web 3.0 and will be like a new protocol on top of the TCP/IP stack. People thinking of Matrix as a IM protocol are missing the point completely.