This question was asked in good faith so I'll do my best to explain. It's hard because I always fear coming off as a pretentious asshole when explaining this even though it is my genuine opinion and not any kind of posturing.

To be fair, I reject the label of "Gundam fan." I do like all the entries you listed (and 08th MS Team!) but with one or two exceptions I believe what makes them good is that they are actively rejecting what it is that defines a Gundam work, and trying to carve out something new.

It is the institution of Gundam that I detest, and that institution was set in stone the day Zeta Gundam made it to air. Rehashing the same characters, the same conflicts, the same plots ad nauseum until they don't mean anything. An echo-chamber. A self-licking ice cream cone. And most of those works listed that I do like were cognizant of this fact and actively sought out to break that cycle.

But I do think that cycle won out in the end regardless. People can insist all they want that this new video game/anime hybrid about killing aliens "isn't Gundam," but I do think it's the logical endpoint to the identity Bandai has fostered over the decades.