Jimi toured with the Isley Brothers. Clapton played with John Mayall. Those were two totally different worlds in so many ways, not the least one of which it what "time" means, how you move it it and to what end.
I liked Cream well enough today through the lens of them being a 60s pop band, and no denying their role as an archetypical transitional band, but as far as anything of continuing musical relevancy, Hendrix FTW not even the same game, much less the same ballpark.