Well, you know why, at least with Stevie Ray Vaughan, right? Well, SRV was doing his thing, doing his electric texas blues and playing the chitlin' circuit, until, bam, his manager gets him a slot on the Montreaux Jazz Festival, 1982. Shit didn't go well at the show. He was nervous, the crowd wasn't ready for it to be so loud, or for electric blues in general, and he kinda got booed off stage. Kinda hard to watch. But, lo and behold, two positive connections come out of that show, one of them being David Bowie, who invites SRV to come play on his album, Let's Dance. The recording was going pretty well, until SRV's wife, Lennie, coked off her ass and constantly demanding to know where her husband was, pisses Bowie off, who basically says, "alright, kick her out of here, and she's not allowed back," which didn't go over too well with SRV. Tensions are already kinda high when Bowie comes back around and says to Stevie, "hey bud, wanna come play on my tour?" SRV goes, "Sounds good, whatever--but I'm not going without my mates" (that's Chris Layton and Tommy Shannon from Double Trouble he's talking about). Bowie says no dice, so SRV says, sounds good, fuck off, gonna go do my own tour. Texas Flood came out that year, which took the electric blues world by storm, as did SRV. He came back to the Montreaux Jazz Festival in 1985, a shy 3 years after he was booed off--but this time SRV and Double Trouble were HEADLINING. Speaking to your earlier point, I think things really didn't go Bowie's way with SRV, so it makes sense that he wouldn't bring attention to it. To his credit, SRV never said one negative word about Bowie or about the bitter end to that relationship.