[cm2187]

That could exclude people who are the most likely of dying of covid (a severe case of covid doesn't mean dying, for instance I heard an ICU specialist explaining that people who are seriously obese often require ICU treatment but rarely die from it, the people who die usually have serious co-morbidities and an already reduced life expectancy).

But it's kind of secondary anyway. The main goal of the vaccine is to stop the virus from spreading in the population and getting a chance to reach vulnerable people. Even if it were to only protect people who wouldn't die of Covid in the first place, that's the vast majority of the population and enough to significantly reduce the chance of spreading.

At the condition that these studies measure the right thing. If it merely stops the symptoms but doesn't stop the spread of the virus, that may be a problem.