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Because other editors interested in the infrastructure may want to raise objections. Like it happened there. This is not such a bad idea in principle.

Though if I edited a template used only on behalf of a single other template, I might have not bothered as well. We unfortunately lack a clear division between "public" and "private" infrastructure, changing of which can be considered equivalent to editing a single template. Which means (among other reasons) that we have to rely on editors' judgement about whether a change needs discussion. There have been repeated complaints about yours being unreasonably skewed in favour of not discussing things beforehand. You might want to remember that.