I voted 1. I tend to prefer to use a published adventure/campaign as the skeleton for my games.
I just finished Out of the Abyss set in forgotten realms with about 40% of the written material excised and plenty of Adventurers League and homebrew stuff scattered in so it finished at 17th level after a few years.
I am also running Shackled City set in Greyhawk with Greyhawk deities etc but with plenty of homebrew dungeons and some other published dungeons like Lost City of Barakhus, B5, B10, a few dungeon magazine adventures, a chunk of the ideas from Serpents Skull adventure path heavily retooled etc.
So I tend to play in a published setting, with lots of stuff from elsewhere and heavily homebrewed. But I figure the majority of people who use a published settings retool them, some more some less than me but that’s just a matter of degree.