I’ve been using “ignore” for as long as I can remember.
Perhaps the best thing about it is that it’s no-tech.
When I see an avatar and certain visual clues I sometimes do a “That one, prattling on again” scroll by skim.
But they have and do provide the tools. There has been a long available Pull Request Welcome for such a feature. That the Discourse team does not think it worth the effort to put a probable damaging feature into Core themselves, it does not mean that others can’t do something about making a feature available for others to use at their discretion.