So you do a review after a manually set learning step, and then a same-day review scheduled by FSRS? Ok, sorry, but that’s a terrible middle ground. Hard no. It’s confusing, and it’s a waste of time. Just let FSRS do everything and remove user-defined learning steps entirely.
I think there isn’t much room for breakthrough out-of-the-world improvement anymore (I hope I am wrong)
Unless this is implemented, yes, there isn’t much left to improve.