Yes sure there are lots of issues with Biab GUI etc..
but just on the point of RealTracks I would like to see the same instrument/guitar mainly Direct Input (allowing whatever FX you like), to have lots n lots of different patterns so you can change patterns at any bar or beat and it will be seamless transition with no tonal change. You pick the guitar and tempo then over to the side you have a preview list with all the patterns (similar to RealDrums with the Variations). The same with a solo instrument.
This would also cut down on the amount of Playable RealTrack sfz's you would need down the track, you don't need FX versions also just the DI that will use a default vst fx. RealTrack are not added each year only new patterns to the existing guitars.

https://stash.reaper.fm/u/ReaTrak (Scripts for Biab Reaper)
Open SGU in Reaper Instantly