Earlier quoted context omitted.
Looking for a job is another part time job, at least for engineers who need to take technical tests.
I know very well. But that new hire somehow managed to find that time, didn't they? If they are that much better than the long term folks, than the salary parity seems to be justified by that also.
There is a sort of asymmetry with how full time salary jobs work, where companies push employees to their limit, implicitly asking for all their focus (or else you risk bad reviews or worse), and at the same time they treat them like assets than can be moved around like chess pieces. The consistent thing would be to allow employees to do their job without caring about the organization, without liking the product, etc., or if the company wants that level of loyalty and passion, they should reciprocate and make sure their salary is growing with their careers and compensating for things like inflation.