Wrt #2, there is the additional argument that when selecting compiler optimizations for a -mtune=generic (or equivalent) target, it makes sense to be a bit "for

Wrt #2, there is the additional argument that when selecting compiler optimizations for a -mtune=generic (or equivalent) target, it makes sense to be a bit "forward leaning", as it'll be a while before your work ends up in a released version, and even further time goes by until that compiler release ends up in the hands of users.