I am glad that the SE staff decided to have the comment deleted.
I like the Stack Exchange model because of the focus on giving good answers to good questions. Main isn't (in general) a forum where one should express ones opinion about things, but it is about asking well defined questions that have well defined answers. As a new user a couple of years ago, I hit this wall and it took some time to get used to the way things work around here. I began to appreciate that it was much easier here to stay on-topic than other places. There is less of a risk of personal attacks and infighting. But I believe that the model is worth defending because it makes SE so different than anything else out there.
I also like the existence of META. I like that it moves discussions about the site away from the mathematics questions. People aren't perfect and there will be frictions once in a while and I am glad that we have META to discuss these issues.
And I agree that META should be a place where there is more room. By definition, it is a place where one can, in fact, have opinions. It isn't just a place for objective answers to objective questions, but also a place for open discussion about the policies of the site. We can effect change here.
But I still don't believe that anything now goes on META. Things ca, for example, be off-topic even on META. The focus should always be on the ball and not the man. Because of this, I also believe that the tone should always (without exception!) be civil. There still isn't room for non-constructive comments. Repeating a word 30 times in a comment certainly isn't a personal attack. But it also isn't very constructive. If someone asks a question or makes a suggestion, then I don't think that it contributes anything to just shout "no" 30 times. There are better ways to communicate that you disagree with the suggestion made. Yes, many strange suggestions have been made on META over time, but why isn't it enough to just downvote and then leave a polite answer explaining why the suggestion is horrible? Or maybe just ignore?
Imagine that you are a new user, as an example. You are getting used to things around here and you have an idea of something that you believe could improve the site. In good faith you make the suggestion on META, because you know that this is the place to do this, and then the first response you get is just someone repeating a word 30 times. I can understand that this might offend someone. I don't know that it would offend me personally, but I can understand that some might find the offending.
Some, I see, might say that this is all just the culture on META. If this is the case, then I think the culture should change.
It isn't an act of a thought police to to remove these comments. It would be wrong if a comment is removed solely because it expresses an (unpopular) opinion.