Before I retired (in the US) the organization I worked for was heavily civil engineering oriented, and they were pretty insistent that the computer folks not call themselves engineers. The state licensing board was pretty insistent too.
I was also in a consulting CE firm working in software, but had moved from an engineering position and had an engineering undergrad degree. I was strongly encouraged to get my PE so the company could advertise it, even though the PE credentials had nothing to do with software development.
I think civil engineering is the main field in the US that relies on certifications/tests for FE/PE, there's probably more I'm unaware of though.
As I pointed out above though, aerospace engineers (working on rockets/space applications anyway, IDK about planes) and electrical engineers don't need those tests. Requiring it for CEs seems like a historical artifact more than anything.
