Yeah, I hope not. About the selling out thing quickly, Barcelona sold out immediately as well is my only concern. BUT you are absolutely right about the line up. It went from Tyler, Bad Bunny, Dua Lipa etc to Nick Cave, Interpol etc. Not really a rager.
My favourite thing about Porto festival (and it's my favourite festival in the world) is how chilled out it is. Like families hanging out chilled out. Would be awful if they changed that. I have no idea what they are doing at Barcelona, it seems like a genuine mess.