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You want to have at least a nontrivial group of every race and ethnicity to ensure that you collect enough data to make sure it's also effective on everyone.

Additional challenges in the US are that many minority communities are distrustful of the pharmaceutical industry due to historical reasons and you typically need a concentrated effort to do outreach there to actually collect enough volunteers to meet your sampling concerns.

It means that it includes people from different ethnicity, ages (also younger and older people) and some immunocompromised people.

shouldnt they be focusing on older people? in fact if they are first to be vaccinated the fatality would drop very very significantly

The 56-85 age bracket is 45% of the volounteers tested, according to Pfizer.

I found that strange too. Diverse is a relative term, not an absolute one.

Random sample of women aged 19-30 would be less diverse than random sample from anybody.

Random sample != representative sample