They're called 'Pista' and for that very reason.
Yes, better wrist clearance, generally narrower.
Within reason you can use what you like in most track races, but be damn certain you trust them.
I repurposed a pair of old Maes pattern bars on a track bike: did a timed flying 200m and after I crossed the line pulled back on the bars to slow down. The LHS folded up at the stem clamp IMMEDIATELY.
I'm only very happy they failed up rather than down as that would have been a very bad thing approx 3 seconds earlier.
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