Yeah, too little too late. Same thing with Zappa doing them.
In real time, I noticed a small but noticeable decrease in musicality from, say, Cream to Zep, and by the time Grand Funk came out of the musical rectum, the kids were NOT all right, the kids were more than willing to swallow that turd whole, over and over again.
I moved on with no regrets - and with no hesitancy. One of the better life choices I've made (not that there were all that many...).