You're not wrong
But there's a cost/benefit analysis behind this decision.
I've never had a lot of love for the ABA, less when they started playing OSCE games with the oral boards, and even less after they conjured that stupid cardiac exam.
It's nice that you convinced your hospital that NBPAS is good. I hope you don't ever have to change jobs and find yourself needing to explain to a confused credentialing committee what NBPAS is and why you're not board certified by an ABMS member. It'll probably work out fine. Probably, right?
The cost/hassle of MOCA is a relatively small thing in the grand scheme. Yes, they're counting on us sheep to just pay the tax. But we sheep are getting something you're not: wide recognition and universal portability. If you don't value that, fine. But don't pretend there's no value there.