I agree with you about kerning, but I think that the stix project is
very interesting and also attractive (to me) because it is a very
complete set of fonts. Once you load them with \usepackage{stix} it's
all done. You have also mathscripts, all variants of blackboard bolds
and many more. However, at this point they still have some open
issues. Let's see.
The alternative you suggest is now very good, but not as complete,
from what I know.
Cheers
Maurizio