I think the “we aren’t touching it for a long time if ever” statement is partially out of design and partially out of necessity.
Design-wise, you’re right in the thought that it’s very deep and no maximums stood out as overly dominant, so let players figure out what’s really OP.
But I think moreso, that statement was made because:
- Sirlin has had a lot of negative feedback in making 2nd/3rd editions to balance things, and
- All his financial and mental resources are now focused on the Fantasy Strike fighting game
I don’t think you came off as overly hostile or aggressive, and my personal opinion is multi-color is good where it is. I think the rule was a great, simple mitigator, and the intent of “always having the thing you bought be viable” was very cool and probably helped a ton with keeping the game balanced through development.
As for “what color would dominate a mono-color tournament”, yes I do think it would be Black, but I also think the better players would win matchups more often than “the better color” would win against “the worse color” in a given matchup. I’d definitely participate in such a tourney!