Bass are simple creatures, with a very small brain.
As a fisherman, I tend to over-think situations a lot...and need to remind myself of the statement above.
Why would a bass hit a spinner-bait, a beetle spin, Mepps, Rapala, jig, Senko, Slug-Go, Jitterbug, Zara Spook...I don't know for sure.
What I do know, is lure manufactures are always coming up with newer | better | flashier | more basic | brighter | darker | etc. | etc. | etc...They are businesses...and their primary objective is to make $$$.
Want to catch fish...get a slip-bobber, shiner or minnows, toss out...sit back...get ready. Pretty simple.