It is also a matter of respect towards professionals. If civil engineer says that something is illegal/dangerous/unfeasible their word is taken into the account and not dismissed - unlike in, broadly speaking, IT.
PII isn't nearly as big a deal as a life tbh. I'd rather not gatekeep PII handling behind degrees. I want more accoubtability, but PEs for software seems like it's ill-suited for the problem. Principally, software is ever evolving and distributed. A building or bridge is mostly done.
A PR is not evaluated in a vacuum