Another way to look at this is that we want reflective comments rather than reflexive ones*. Reflex means predictable and predictable means tedious. Tedium is really what we're trying to avoid on HN—not criticisms of monarchy. I'd have thought that was painfully obvious, but I realize it's neither so obvious nor so painful to people who don't deal with it full time.
* https://hn.algolia.com/?dateRange=all&page=0&prefix=true&sor...
If we can't communicate about it, the tedium never leaves.