As the developer himself states, and me as someone who uses it as my primary daily driver concurs, it is not quite ready yet. e.g. a good fraction of the Notifications I receive end up being dead links to posts that don't exist anymore, or to users that I have blocked, etc. Also user tagging is not implemented yet and searching often does not retrieve things that you can find much more easily using Lemmy, plus tools for moderation of remote communities remain very primitive.
Soon now, it will be user-friendly enough to recommend to people, but for now it's primarily for beta testing the software and those of us prepared to use an early adopter mindset when using it - e.g. switch to a Lemmy alt to do things that PieFed cannot yet.
Though more features get added seemingly weekly or at least monthly, it's so exciting to see! I love the new inline comment feature, though inconsistently applied e.g. not yet available for edits. But it's coming!
PieFed solves all of that. It isn't quite ready for the non-technical masses from Reddit, but those particular issues at least it does solve.
I kinda want to recommend people to simply visit https://piefed.social/ and see what will eventually become available as a standard Threadiverse software suite just like Lemmy and Mbin.