So from what I'm gathering, the point of the original post is to say that if someone comes on here and says "X sucks and shouldn't be in the game"... it is a waste of time for someone else to come into the thread and say "Well, then just don't use X."
If I'm misinterpreting the point, please correct me.
But assuming I'm on point, there are really two different aspects of this that require discussion. The first is when the game already includes X, the second is when the game does not yet have X in it and there's still a possibility that the D&D staff could be convinced NOT to include it in the future.
It may be my DM is my best friend and loves option X, and if it becomes an official option he's going to use it in our game. And I really don't want that. (And given in that case if what I'm doing is preventing somebody from using their preferred playstyle I'm apparently willing to do it to my best friend. So I'm not likely to be persuaded by that argument from some stranger on the Internet.)
It's been commented by WotC staff that upwards of 9 million people play the D&D tabletop roleplaying game.
But, there are roughly 2500 WPN stores that run Adventurer's League. Even assuming each store has 20 regular players (enough for 4 tables) that's only 50,000 people. More people watch Critical Role live each week. It's only 0.5% of the audience.
While I think they look at AL and consider it, they likely consider streamers and online players and people who play homegames only far, far more heavily.
And there are also all the players who play AL as their home games and those players who only get a chance to play AL at conventions and those players who only get to play AL on digital platforms in online games and those players who play at other non-WPN stores or other public locations such as gaming clubs at schools and libraries and all those players who would play in AL games, but who do not have time free when local games are scheduled. Don't assume that the only AL players are those in WPN stores, as I am sure WotC does not make that assumption. If WotC did not care about the impact of new books on AL play, they would have never reprinted material in XGtE, material that seemed to be reprinted solely to benefit AL players and their +1 rule.
I'm specifically talking about the following:
"Let's talk about X"
"It sucks. I hope they don't add it to the game."
"Then you are selfishly imposing your playstyle on others."
It's that third bit that I have a problem with. It's basically saying, "Don't participate in this discussion unless you like X."
This all comes out of the "No Magic Shops" thread (which I don't recommend you read), and your second aspect is the accurate one.
Beyond that, I'm not going to comment - I should have had the sense to stay out of that "discussion" the first time around.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.