Nit pick: A# major would be 10 sharps, at least written following the usual convention of each note letter being used exactly once: A# B# C## D# E# F## G##.
What is 2 but 1 plus 1? The key of B flat is easier to read.
Disregarding how it'd be read, I suppose you could theoretically get into keys like G-triple-sharp or F-quadruple-flat -- but that's just overcomplicating things, isn't it?
Disregarding how it'd be read, I suppose you could theoretically get into keys like G-triple-sharp or F-quadruple-flat -- but that's just overcomplicating things, isn't it?