If it works like blocking works for users/communities, posts from blocked instances shouldn’t show up in Alexandrite too.

Yep, I would like to do that at some point, just haven’t been working on Alexandrite all that much lately, but it’s still on my todo list!

Or find and replace all the periods with ones that are slightly larger font.

Oops forgot to post links, I edited the post.

I host Alexandrite at https://alexandrite.app/ and several instances also host Alexandrite on their own domains, like https://a.lemmy.world

This is intentional, but I’ll probably be changing it.

When you click a post while in a feed it changes the URL so it’s easier for people to share links to posts, as people probably are most used to copying a URL out of the address bar to send to people. It causes a lot of issues though, like the one you mentioned, and the ‘back’ button on your browser basically doesn’t work either. Because of all of that I’m probably going to remove that feature, and make a more prominent “share” button somewhere.