Automatically enrolling everyone's coins in to coinjoins means that institutions will always have a nice pool of liquidity in which to coinjoin, which is exactly what Wasabi want.
And why do the
institutions of all people need to use CoinJoin on their assets in the first place? Do they have something to hide too?
I would generally say that everyone should have a right to privacy; whether they've nothing to hide or nothing to show, whether private or institutional.
On the other hand, large investors often prefer to buy ETFs / keep their coins in the hands of a broker / exchange, so it's still a good questioin. I'll add it to my list. It's actually already done, but I will sneak this one extra point in there.