I completely agree, and I've said as much before - if everyone just started mixing their coins as their standard practice, then the concept of taint would disappear overnight and bitcoin would be completely fungible. Every centralized service would either have to accept any and all bitcoin, or go bankrupt. Bitcoin would be completely fungible, no one would end up with accounts being locked for arbitrary reasons, blockchain analysis companies would be useless, everyone would regain so much lost privacy, and the whole ecosystem would be far better off for it.

However, we both know that is never going to happen. When we can't even convince large portions of the community to actually hold bitcoin instead of holding an entry on some exchange's spreadsheet, then trying to convince them to mix or coinjoin all their coins is a pipe dream.