It is an opinion, and it was obviously written in spare moments that can be identified as idle. But it is far from an idle opinion. I consider that a personal attack.
Furthermore, my opinion here is, in fact a technical comment. Hidden open braces inside a macro expansion that are explicitly closed by ones written by the user, and vice versa, is actually a technical issue, not simply aesthetics. The two are not entirely separated.
It doesn't match the Go syntax that it's trying to quite faithfully imitate. This is for a psychological reason, which I'm dispeling as a needless concern.
It's fairly obvious to me that the author wanted that identifier; I'm just saying that the reasons against changing the name are weak.
Furthermore, my opinion here is, in fact a technical comment. Hidden open braces inside a macro expansion that are explicitly closed by ones written by the user, and vice versa, is actually a technical issue, not simply aesthetics. The two are not entirely separated.