Shapers are a mixed bag. If you're running enough straight stock making moldings, you've probably got enough featherboards and/or hold downs if not a power feeder set up that you'd really have to try to get hurt. For smaller jobs or curves work, it's a tossup, but yeah, a lot of it gets done without a guard.
Jointers I'm going to disagree with you: I pretty much refuse to run without a guard. Except for rabbeting, I haven't found a good reason to do so. I have done so in other shops, usually on machines so old that the guard was lost 50 years ago and is irreplaceable. Generally though, if I don't see a guard on a jointer in a shop, I'm pretty wary about what else might be being treated a bit too casually. A guard on a jointer is an easy win with very little downside.