It might be worth talking to some more advanced users about the ways that they would like to tweak patches and seeing how those can become a part of the intentional programming of the Spitfire player. I.e. in your Kontakt releases on non-legato patches, I love the ability to jump behind the wrench and play with things as simple as the attack speed on longs or what have you to turn it into an easily playable pad patch.
Being really intentional and simple with the presentation and usage of libraries in the new player is great for the largest subset of users, but kind of robs the advanced users of previously accessible tweakability, stuff that we sometimes rely on.
Here's the thing: I get that you guys are trying to do more complex things nowadays, and control over the programming is a key part of that. I don't think most people understand how complicated the programming in just legato patches is becoming nowadays. Like the way that releases scale and legatos adapt based on the speed of playing, or even the timed release tails on marcato and tenuto articulations and all that fun stuff isn't compatible with blunt ADSR controls. Global ADSR controls can cause that stuff to break down REALLY quickly. Heck, you can create those issues in lots of Kontakt instruments that let you get behind the wrench by nudging a few things around. Turns things into a mess because it fights the intentional programming. (This isn't exclusive to Spitfire libs. The more advanced programming gets, the less we can just "tweak" fundamental things without breaking everything)
I guess what some people are asking here more than anything is an ability to "scale" some of this programming in a proper way. Manual legato speed (I really miss this one from previous Spitfire libs), release tail volume, attack speed on appropriate articulations, etc.
Then there's the big issue of tweaking the start time on individual samples. Jumping behind the wrench to change a sample start point wasn't too much fuss. Heck, the COG system in your Kontakt player, though a bit funky to use, was at least a nice option.
Obviously you can't let us dig into the nitty-gritty/debug layers of the engine without exposing a mess of custom backend (Kontakt has spent years and years and years developing their editor to be at least semi-usable by laypersons), but more tweaks on the front would be lovely lovely lovely.