Just regarding this bit:"...but it's for those that show...

Just regarding this bit:
"...but it's for those that show moderate to severe symptoms.. Which in percentage terms, not that much..."

Various sources are quoting a 15% rate of moderate to severe symptoms. This letter of warning to the international medical community from Italian doctors states 10% require the ICU. https://mailchi.mp/esicm/the-future-of-haemodynamic-monitoring-first-webinar-of-the-year-1009715

Here is some modelling about the projected number of cases, how this could play out.
TLDR; 10% of half a billion = 50 million people requiring ICU by mid year.
https://nevinsresearch.com/blog/straightforward-calculations-covid-19/

Lets hope these models are wrong.