You realize mild means “didn’t require hospitalization”, right? Many “mild” cases are taking weeks to recover.
But more importantly, you’re not dying and not clogging up a hospital. That’s what’s relevant to this discussion.
It will be a big problem both in Europe and in the US, because they are starting to take measures only now.
The vast majority of cases are mild, like a head cold. This is a fact, and has been reported around the world.
You’re arguing about relative hospitalization rates, but that has nothing to do with the discussion here. Mild cases aren’t clogging up ICU wards at all, because they’re quite mild.