The first person I got with a letter I had actually looked at their letter before -- one of their requests is for Shang-Chi which I have seen although wouldn't feel super confident writing for. Actually the thing that throws me the most is that they've requested 3 characters, and while their prompts imply you could just write 2 of those, they haven't explicitly said that. So I would probably want to clarify that before I go around accepting the assignment ...