Think all those Edge style dotted 8th rhythms for example
Even those usually aren't tapped in on the fly live, they're pre programmed to a specific setting or sync'ed with the drummers click track.
If you got exited live and tapped a little fast, you'd screw the whole song up in front of a stadium of people quite possibly.
Not something I really need but I can still see the use. Even in my situation I would still find it more useful than dual profiles or a touch screen display.
Agreed.