Bitstamp, Binance, Coinbase etc., always treated bitcoin as non-fungible and enforced these arbitrary rules against mixing. You're not affected if you don't use centralized exchanges.
I did sell at Binance coins mixed at Chipmixer in the past year. Nothing bad has happened, everything was processed just like other non-mixed coins.
So for now I think that the "fear" of mixing may be a bit exaggerated. Or maybe it depends on the exchange too.
Of course, reading TOS is a must. Of course, testing the waters may be useful. Of course, keeping too much money on centralized exchanges is (and was) never a good idea.