I've said it before, and I'll say it again : eventually you just fucking end up with "be a complete person; here's the entire dewey decimal system."
STEM is meant to deal with logic based thinking and the problems unique to that industry, like for instance, a huge gender gap. Shoving arts and humanities in doesn't fix the issue. Cross disciple collaboration is great, expanding your horizons and putting ethics into practices is great, but that's not what STEM is.
There are already plans for these things in practice (hippocratic oath, iron^[https://en.wikipedia.org/wiki/Calling_of_an_Engineer] ring^[https://en.wikipedia.org/wiki/Iron_Ring] ), which need to become more widespread. We don't have to have STEAM toys and SHMEAT courses.