To me, the UI is the most awkward, dated part of P2A. It looks and works like it was developed for Windows 95. It’s effective and works, but looks and feels so dated. And navigation is rather awkward. There would be far better ways of doing things in this day and age to improve the UI and UX.
While P2A certainly isn’t perfect as an ATC solution, IMHO it’s head and shoulders above default ATC. I haven’t really used other 3rd party ATC, but from what I’ve seen of them in product pages, videos, etc, at least for my use case, P2A is definitely the better solution.