If we followed the “if it ain’t broke, don’t fix it” philosophy, we’d all be driving Model T’s and working in CICS and there would be little reason for innovation.
I prefer the “if it isn’t broke, improve it” philosophy.
I've always found the quickest way to progress is "If it ain't broke, you're not trying hard enough."
The corollary is "Technology is a lot like violence--if it doesn't solve your problem, you're not using enough of it."