Clubs and live gigs / venues etc are always mono because it’s impossible for the audience to all be in the centre. Overly wide mixes with phase issues suffer in these situations.
Back to the topic, pan law has absolutely no impact whatsoever on the width of mixes - it simply governs the level of the signal as it moves between the speakers. Set the pan law to whatever you like, there isn’t anything going on that can’t be adjusted by simply moving the tracks fader up or down.