Some people like off the rack, some people like bespoke tailoring... Eventually, it all boils down to the fact that you are wearing clothes. How well you want those clothes to fit and look is up to you...

Off the rack can sometimes be perfect. Sometimes not. Then it is up to you if close enough IS close enough. On a gig, you don't have the luxury of replacing that which doesn't fit with something that does by using non-realtime measures, other keyboards, software, whatever. It's at times like these that doing a bit of surgery on the style pays dividends...