Awesome post, Rich! I don't often post here but had to speak up in agreement.
I was simply highlighting the incongruity of a post that frames the issue in terms of Turbo-Xerox (TX), asserts that TX is dominant in the format, and then opposes the restriction of Preordain.
If TX is dominant, you attack the cantrips, which is why Ponder and Brainstorm are restricted, not win conditions. Because if it's TX that is dominant, and not the win condition, then restricting Mentor should have no bearing on the dominance of TX, according to the logic Rich set out. The analysis as presented and conclusions of the OP are logically inconsistent.
Steven, you're using your lawyer powers for evil here - you strawmanned Rich's argument. He doesn't argue that it's bad that TX is dominant. If he were to have argued that, then I agree the correct approach is to kill the cantrips.
However, Rich actually advocated for diversity. I can't imagine anyone arguing against diversity as a hallmark of a good metagame. His proposed policy for achieving that was to weaken TX decks without killing them - a fine line to walk. The point of banning Mentor is that it (1) allows for greater diversity of TX shells, and (2) reduces the overall power level for them (because Mentor is so ahead of the curve). This allows the rest of the metagame dilate to target different sets of decks.
It's fair to question if TX will still be dominant and if so to what extent with the restriction of mentor, but I'd guess that it would open the format up considerably more than banning Preordain would.
I made an account just to say this to Abe: you were one of my favorite judges to interact with back when I was an L2 on the East Coast (rl name is Greg Mitchell, not sure if we ever worked an event together). Without the full context you had, some of the rulings didn't make much sense on-site, but I fully support you made the best decisions you could. I respect the hell out of you coming here to face internet vitriol to help educate and explain.
It sounds like there's just not a good solution without being able to read Joe's mind. I'm not sure how much more productive this thread can be. Wizards obviously is aware of the allegations at this point; further interrogation of Abe or finger pointing is more damaging to the community than anything.