this does not mean that it will always and everywhere be like this.
There will always be decentralized exchanges, which are superior in terms of enforcing arbitrary coin criteria, because they cannot be shut down. So you will always have the option to go and buy / sell this way.
Although it seems that some centralized exchanges even today will automatically block your deposit if the incoming bitcoin had traces of passing through the mixer in its history.
Great, so don't use a centralized exchange. You will never have your coins treated unequally in Bisq.
You contradict yourself. First say that the history of a particular bitcoin does not matter, and then admit that this is only true until you use centralized exchanges, otherwise you will have problems freezing funds. And problems with freezing funds will also arise for someone who buys bitcoins from you that have passed through a mixer on a decentralized exchange, and then wants to bring them to a centralized exchange. For you it doesn't matter, but for someone it can be a serious limitation in the freedom to manage their funds. So don't tell me that the history of a particular bitcoin is unimportant, because it isn't. Conditional freedom is a kind of non-freedom.