With just a single account on ~~any~~ most Lemmy server(s) you can read and write ~~everything~~ most things everywhere else.
Click on the "all" button and you'll see content from ~~all~~ some subreddits on ~~all~~ some servers.
I know I am nit-picking, but this over-selling of federation as if it "just works" and takes no manual effort almost drove me away when I first joined. It did and still does drive me away from Mastodon, but Lemmy is not as problematic.
At any rate, I know we don't want to overload new users with talks of defederation and unfederated content, but pretending it doesn't exist makes for a very frustrating time the first time someone realises they can't see 50% of the posts or thinks Lemmy as a whole is really quiet when it's because their server isn't federated 100% with every other server.
I installed this after seeing your v1 post and already got use out of it resizing some images on mobile. The only thing I noticed as lacking was a multiple file selector, so this is a great first update!