As someone who lives next to a river with a bait ban for 3 month every year, I have done my involuntary share of fishing with wool for cohos.
I can say with certainty that cohos will bite a well presented wool under certain conditions.
In my case, I target fresh run (typically sameday from salt fish) cohos as soon as they moved into a tailout in lower river.
Some of these fish will bite a well presented, typically dead drifted, wool as soon as they arrive at a new pool.
Once they get settled in, bite is pretty much off.
It is a very low yield game, but I do catch my share of cohos doing this as I do not intentionally floss for them.
Yes, some cohos do get flossed while I am doing this, but I do know which is which.
Because of this limitation, in my personal observation, vast majority of cohos in crowded bait ban rivers are flossed as a result.
Above applies only to unscented wool, as applying scent (allowed in non-baitban rivers like Vedder), is a different game.
Jensen egg with wool combos are more effective than plain wool, but they can't be used in a bait ban river as it is typically anise oil scented.
Do I use roe on Vedder? Of course, as I can catch a lot more cohos than if I were using plain wool.
Just my 2 cents worth.