Not disagreeing with you regarding the Garden Stage but in terms of Cat Power, that's more to do with her i think. I too saw her that night and i've seen her a dozen times over what must be 15 years or so and i honestly think she's been 'flawless' once! She always leaves the stage only to come back and promptly leave again. I genuinely don't mind it... i guess i just accept it as the price for hearing her sing!
I really hope she returns to EOTR in '19... probably Garden again if i had a choice but, to agree with you again, hopefully with no sound issues as definitely a factor this year.