The cap table tells you who else thinks the company is worth something at that stage. It can be a great indication not of like future dilution, but of who else is on board.

If you take the lotto ticket perspective, you should do everything you can to maximize your odds and part of that is doing as much diligence as you can on the company.

If I were joining as a first/early engineer, or at a senior level - particularly early stage - I'd want to see the cap table.