That's fair enough ☺️
I own two Warwick Broadneck basses with 47" radius and as I mentioned I tried a fully flat ACG. If I was blindfolded and was handed a 47" radius fretboard and then a fully flat one I would not be able to tell the difference,in fact forget the blindfold! After a certain radius size (I can't say which but for the sake of this conversation let's call it 16") you'd be hard pressed to tell the difference between that and a fully flat one. I definitely notice the difference between 9.5" and 12" but after that(to me) it becomes imperceptible. I totally favour flatter boards where I don't have to go searching "downhill" for the outer strings 😂So my Warwicks although technically not flat feel just like the ACGs in my experience.