The difference is for others than "engineers" (software developers), where there is an expectation of certain quality when they hear someone call themselves "engineer". Just like the title "doctor" carries a certain expectation.
It seems reasonable to want licensure on the belief that it raises quality.
It seems unreasonable to expect people to conform to your language preferences.
Is it "language police" that if you say "bomb" on an airplane, people might take that very seriously and you might get in legal trouble? Is that people's personal "language preference" or might there be some other implication behind some of the words in some contexts?
It's not about the word itself, it is about what it represents and the risk profile if it's true (nowhere to run to).