I second your recommendation of Art Pepper's "Straight Life" autobiography. Very candid & open about his life, warts and all. He WAS a huge drug addict and unfortunately, due to prison and drugs was off the scene for about 15 years. What a waste. We are lucky he made a comeback and was creative for the last few years of his life. Very powerful emotional player in those later years.
You were lucky to see Jimmy Cobb live I am not sure if he plays live concerts anymore. If you don't have them I recommend Cobb's cds "Cobb's Corner" & "Jazz in The Key of Blue" with Hargrove.
I think frogman stated it very well in his post :
"Different players bring different things to the table" . I say if one person likes an artist and another doesn't so be it. As players bring different things to the table so do we, as consumers . We all hear differently , have different life experiences and come from different backgrounds. I feel there is room for all musicians. If I don't like it I don't listen to it or buy it.
I am always looking for new jazz artists/groups and that is one of the reasons I come to this site. If it turns out that the artist is someone who recorded before 1970 and I have overlooked him/her than that is still a plus.
BTW i've seen Stanley Clarke live and he can play the hell out of the upright bass
But I do agree with rok2id about Charles Mingus. I do not think bass player but I do think composer,& bandleader .
Cheers