One of the most important things to do before investing or buying, Beside that advisor board was also need to be considered beside core team.
Depends, If they DeFi or NFT then choosing the most efficient Blockchain network it's also considered
It will be need sometimes for sure but yeah it's also another important indicator before investing or buying for long term
Not really important i suppose but another good indicator
Sometimes newer project have more potential rather than old one so it was depends on the development, price, partnership, etc. Not really important from my opinion
Stability in what terms? Price? If so then it's not really an main issue, From my perspective the main issue is the development itself.

All of your question it's an good basic refrence before doing any investment for mid or long term.