They are doing something that is only to their own benefit in a context where other people’s lives are at stake.
Quite simply it is unprofessional. A person without a license can hire a licensed professional for oversight. That’s the responsible thing to do.
In the US, engineering licensure requires supervised experience, testing, and typically (but not always) formal education at the bachelor level.
One requirement of professional practice is not working beyond one’s competence irrespective of having a license and engineering boards take that seriously.
I guess that’s the thing, an unlicensed person doing unsupervised work requiring a license is some combination of incompetent, unqualified, or negligent.
To put it another way, licensure ensures that a person has a minimum amount of skill, training, and experience. And that they take responsibility.
Yes you can hire an engineer to supervise your work.
Then you have successfully avoided responsibility for it.
And legally as well.
A license would allow you to take responsibility for what you do.
I can understand why someone wouldn't want it.
I don't understand why someone who has chosen that route whines about it.