Parmandur
Book-Friend, he/him
There is a table for this in the DMG. The math works well in practice.the math is broken it doesn't work. You can not compare being slightly better at something everyone is okay to good at to the choice to be able to alter major things...
this is why I see 10x the hexblades sword bards and blade singers then I do fighters... and i almost never see just straight fighters