I don't see that. RCAs aren't real employees, only Temps.
No matter what the contract says, the wording on my job description posting in 2016 strongly steered the applicant to believe (no matter how falsely) that this job was to cover a single route for a single Regular. I had no reason to question their motives, I was just entering into an agreement. "We'll pay you less because you have minimal responsibility and demand".
Naive, in hindsight, sure. But it was the impression that was conveyed on me. An RCA is never "same as a Regular" in any aspect in this organization.
Regulars never have a worry about casing unfamiliar routes, finding an address, looking at blank mailboxes, stressing to get out of the office, having to mark packages with names they've never seen before. Not to mention Regulars run 1 route, all the time, and get paid twice as much (and have a retirement hope) for that luxury.
I understand that some/many RCAs want/need extra hours. But it seems there's no longer any thought that some don't. And they don't want the burden of bouncing around like a transient. Doing multiple jobs for low pay while being held to the standards of a a someone with a single job at much higher pay.
Now its morphed to "We'll pay you less because we can squeeze and screw you over to avoid paying our better compensated employees."