When they closed the discussion, they explicitly welcomed people to talk about it outside their issue tracker:
> Our issue trackers (other projects may differ) are used to track the work for maintainers or soliciting community contributions. They do not exist for people to debate the merits of decisions already made. We have Homebrew/discussions (and, well, the rest of the internet) for that.
They just don't want discussion about the merits of a settled decision to interfere with their work tracking when they provide a perfectly good discussion forum[1] for that.
Perhaps someone with more information will chime in, who isn't a homebrew maintainer.