Some younger people are indeed hit harder than expected (my husband knows a woman - a former co-worker - who was insanely healthy, and is still recovering from the the COVID pneumonia. She was not hospitalized, but I gather there was at least one ER trip.
But yeah, I can definitely see the argument for “wishing I’d had it and gotten it over with”. I semi-facetiously wished that for myself: I’m higher risk, but hey - get that ventilator while it’s still there!.
The question on lasting immunity is more concerning. I do know that as an adult, I’m less likely to catch colds than I was when I was younger - EXCEPT when my kids were school age. And once, about 28 years back, when a co-worker had been to Germany and returned with a nasty cold, which she shared with everyone who sat near her. My theory was that it was different enough from any virus we’d met before, that we had no lingering immunity. Does having a particular cold virus (rhino or corona) provide some lingering immunity that at least reduces the severity if you meet it or a close relative again?
Ventilators are in reality not much of a rescue for Covid 19 cases who need one. The majority – the large majority – of ventilated patients die anyway. Those who live often have permanently damaged lungs or other damage because of the invasive procedure. The issue is that this virus creates so much more damage to lung tissue than usual pneumonias.
Lockdowns have been slowly happening state-by-state. The remaining ones have very few cases yet. Georgia and Florida were rather late at it and were starting to get really hit.
You won’t see any effects of lockdowns for several weeks in most cases. But the early places like on the West Coast are starting to look promising.
The late lockdown states with significant cases might show higher than average deaths down the road. But with all things CV, the data is unpredictable at this point.