Having thought about this a bit more...
Having been recorded in recording studios on multiple occasions
(as a drummer, spoken word stuff, and as a singer)...
My opinion has some value to the sound engineer in terms of:
"Do your drums sound like you want them to sound?" or,
"Would you like me to add some more reverb in this bit to give you more gravitas?"
But my opinion on how to set up a recording studio, mike up a kit, etc. is pretty much irrelevant.
This can change as expertise grows.
For example, my ex girlfriend (professional singer) had her own microphones, different ones for live and studios. I never saw an argument from a sound engineer about her using her own mikes, as far as I can tell, because they agreed with her choices.
I'd expect you to be able to tell me if microphone choice actually makes a difference for recording singers, in my case, I just do what I'm told.