I usually can’t find what I’m looking for, so a larger catalogue would go a long way. I also had problems with some software versions. The one that comes to mind is that Firefox had behavior with the save dialogue that I don’t like. It’s a minor issue, but one that I don’t have with the build in the Arch repo. I have a vague memory of something just not working, but I couldn’t tell you what at this point.
It uses the system dialogue, but it starts from the same directory each time. If I’m saving files it’s usually multiple files in succession, so I want the dialogue to start off pointed at the last directory I saved to. The Arch build does that.