“the Poskim of that day who opposed Rav Goren used are exactly the OPPOSITE of the reasons given now to support Rav Sherman. “
Correct. Except that Rav Goren pasuled a single conversion after an investigation. No reasonable person could object to that. Rav Sherman pasuled thousands of conversions without hearing the individuals involved. There is no basis in halachah for doing that, and the talmud has horrible things to say about dayanim who decide cases without hearing from all parties involved. Rav Sherman should have the status of a Reform Rabbi and fortunately the Dati judge on the Israeli Supreme Court overturned his outrageous decision.