It's good to read that you're happy and that the Pa4X serves you well. That's what matters! 👍

I had Pa4X a couple of months before I got tha Pa5X, and even if Pa4X is a great machine, personally I would choose the Pa5X over the Pa4X without any doubt.
As well as Pa5X is a wonderful machine, to me the new Pa5X OS is much more logical (and similiar as i.ex. Genos and PC'ish) compared to Pa4.

I think Korg is going to sort out the things not fixed or added, and even add more fun to the Pa5X.
I'm pretty sure that the users that's not fully satisfied now is going to become more happy with the Pa5X as further updates pops up. ❤️🌞