I have long since quit jacking around with mixed brass in 9mm.Got tired of struggling with range pickup 9mm larded with off brands and their small flash holes and undersize primer pockets.
Pulled them out of the system and loaded the tumbler with some once fired agency range brass, mostly Federal.
Maybe I will gradually prep the junk brass in the winter doldrums.
I still pick up brass, that wont stop until I can't physically do it anymore. Now I toss them all in a bucket. When the weather is bad and I'm bored, I sort out a few specific brands to keep and use. The rest go into a trade/give/scrap bucket.
Having said that, other folks need to do whatever suits them.