Google gives their word that Chrome itself will keep it disabled for a random 5% of users at launch.
I’ve emphasized what I view to be the problems.
This requires you to trust that Google will actually do this at launch; and to be fair I expect they probably will. That said, it’s not a legally binding statement. Promises are cheap.
This requires you to trust that the ‘random 5% of users’ figure will remain a thing forever, and not be silently rolled back in a Chrome update two years from release once most of the complaints die down.