My biggest issue is when having to copy multiple fields from an entry into the webpage and having to use the search (because the entry is for a different domain or just a note or a card) you have to search for the entry again and again because the search key doesn't persist

Yeah that gets me somewhat frequently too, and second the request you have.

Another silly one is adding custom fields, you can’t change the type between visible/hidden once it’s created, so if you mess up, you have to delete the custom field and add it with the desired visibility. Ughhh

another is that if you do a search then click on an entry and do another search, the entry details displayed and what's in the search box don't match and it's not clear unless you're paying attention.