Re: Is it fair to play live with a metronome?
What makes it "unfair" ?
Using the analogy above, it's not fair that any of us use a decent drum kit, because drummers of 100 years ago did not have access to tunable tom-toms, well functioning bass drum pedals, or well made hardware. Drummers of 150 year ago, well, didn't have drum kits period. And this can go on and on down this road (see the thread on close mic-ing).
Music has no rules, and what rules exist are made to be broken.
Otherwise, the only music in existence would be Gregorian chants and primitive tribal music.