CPAP/BIPAP for respiratory issues isn't a new thing it's been used for years. It is seeming that some people's outcomes are better for it for covid but then that would be true for other respiratory symptoms too.
Ventilation isn't always the answer for lots of reasons. It's not a pleasant thing to put the body through. It's still the last resort. People aren't taken into hospitals and put straight onto one. It's the last chance.
For example my mum had COPD she slept upright and had CPAP to sleep at night and o2 in the daytime. We were told in her 50s ( a good few years before she passed away) her lungs and body wouldn't cope with ventilation. She was always treated in hospital but with CPAP and antibiotics as the highest point of care.
I work with Paeds patients that have CPAP at home too due to chronic lung disease.