No. Nobody knows how what the actual proportion of cases require hospitalisation. That's the point being made in this entire thread.

It's clearly very hard to let go of what looks like data and say "actually, we don't know". That's a driving cause of current events. There's a lot of analysis out there right now quoting things we "know" about SARS-CoV-2 and when you dig in, it's not real knowledge, it's a garbled or misused statistic. We have lots of epidemiology but not enough epistemology.

On top of that - and I think this isn't seriously reported on just yet - you start bleeding doctors and nurses, especially as nobody in the West has enough PPEs to keep them safe. There are only so many of them to go around.

Indeed, yesterday, more people in Lombardy died of COVID19 than on an average day from all causes combined. And they are on a lockdown for 11 days already