I was also thinking if we find and direct new devs to develop on Steem - shouldn't there be a sort of guideline which includes all resources (including the list of all proposals in Steem Suggestions like you already said) - something like How to Get Started?

I agree. There's a lot of documentation that could be created in order to attract new developers and help them when they get here.

It's easier to get in and stick around when the environment is more welcoming and supportive.

💯 - Very important point.