Thanks, very interesting!
I agree the examples you gave could be done by a recent graduate. (Though my guess is the community building stuff would benefit from some kinds of additional experience that has trained relevant project management and people skills.)
I suspect our impressions differ in two ways:
1. My guess is I consider the activities you mentioned less valuable than you do. Probably the difference is largest for programming at MIRI and smallest for Hubinger-style AI safety research. (This would probably be a bigger discussion.)
2. Independent of this, my guess would be that EA does have a decent number of unidentified people who would be about as good as people you've identified. E.g., I can think of ~5 people off the top of my head of whom I think they might be great at one of the things you listed, and if I had your view on their value I'd probably think they should stop doing what they're doing now and switch to trying one of these things. And I suspect if I thought hard about it, I could come up with 5-10 more people - and then there is the large number of people neither of us has any information about.
Two other thoughts I had in response: