i use a similar philosophy. no point in flushing a good day of fishing down the drain just b/c ur trying to force feed them a spinnerbait etc when they don't want it. i'll dedicate some time and more importantly some key locations to the new lure. but the other 80-90% of my time/day off is devoted to enjoying fishing.
time on the water is invaluable for learning a new lure. next best only to having an experienced angler teaching you. more time on the water means the big picture starts to become clear ie where and when to use the lure. and learning not to get caught up in the 'how' of a lure.
"I want to learn how to catch bass on spinnerbaits" sounds great. but it doesn't sound so good when you fishing the sentence with "..in the middle of August, in small farm pond, with water temps close to 83 deg and weed growth at maximum". this is a bad time to learn spinnerbaits b/c this overgrown, under oxygenated small body of water is just too hot for the fish to be chasing them. researching the time of year, depth and location of a lure will put you ahead of the curve as opposed to just learning how to retrieve it.