Just to bring this back on-topic a bit... I do hope XenForo, in its current state, isn't still the go-to in 10 years' time. The world is a constantly-evolving place: the internet is radically different today from when I first started out, and I expect it'll be radically different in the future, in ways we can't yet imagine. In that climate, standing still is just a death sentence - and even if you do survive, you lose all relevance.
I do wonder whether the Flarum- or Discourse- style of forums will ever take off. So far, they haven't - which I believe is because they just haven't found a market. They're trying to win over the social media crowd - but those people won't use something that's like social media, when they can instead use something that is social media. On the other hand, the people who still use traditional forums stay away from Discourse too, because they just don't want to re-learn how use basic features. (And also, I don't think it helps that 'Discourse' sounds similar to 'Discord', and therefore often gets confused with it, even though they're completely different services...)
It's a shame, because I like the Flarum/Discourse concept - but if nobody else is going to use it, there's no point...