The linked Mozilla bug report provides an excellent reason to drop P-521.
If you look at the telemetry for last actual Firefox release, only 8 (yes, eight!) out of 1.67 BILLION handshakes used a P-521 curve. This is a good indication that P-521 isn't needed, at least for certificates verified by web browsers.
Certificate authorities like Camerfirma[1] were revoked from all browsers because of numerous policy violations. This legislation is intended to force browsers to accept their certificates.