Personally I'm finding the player nice to work with. Yes, it has a few hiccups here and there but everything does.
To me the main things are that clicking through many menus, whether it's mics, access vibrato, or even see more articulations (like Kontakt), is something that could be refined for 'Pro Player', reduce the amount of clicks for the user, it will increase our productivity. (A purge function too would be awesome.)
Regarding the Pro View, it a nice sounding addition. If a pro view is a button which changes the player into a new GUI hopefully this doesn't expand the CPU/ram footprint of the instance. As if it did I'd rather have a separate 'pro' vst to load. For labs, simple is fine. But for large libs like HZ string loads of control with minimum menu hopping is beneficial.
Also just want to say, not complaining, just my thoughts on possible avenues for the player.