Even if you stay below the hospital carrying capacity, people still die. It's just 1.5% instead of 5% or more. Anyone who is on a ventilator for two weeks is probably not going to ever recover. The problem is that you need an endotracheal tube or tracheotomy. Then you need to be in a medically-induced coma so you don't fight the ventilator or yank out the ET tube. You need to be paralyzed so the ventilator controls your breathing. That takes continuous drug administration. All these things are pretty precarious. Bacterial infections are common.
There are some advantages to the CPAP machines the Mercedes engineers are producing in the UK: They use a tight-fitting mask so there is no ET tube. No drugging is needed. It does not really breath for you, but when you suck a little bit of air in, it helps fill your lungs. Then it maintains some expiratory pressure when you exhale, which is good for keeping Covid-19 infected alveoli open. These are great for patients who have not got to the stage where a full ventilator is needed. They may be enough for most patients.
There's also a new "helmet" style rig that loosely resembles an astronaut helmet, only the whole thing is soft clear rubber/plastic, and it forms a seal around your entire head. No ventilator, just the hospital oxygen supply and soft pressure regulation, almost like hyperbarics, except it's just your head, not the entire body.
I'll try to dig up a picture, it looks promising.