It isn't that getting ahead of a curve is a bad thing.
It's that, methodologically speaking, 'future trend domaining' as a practice by people who are otherwise unskilled at domaining is a waste of money and time. The result is a lot more money being lost than there is money being made. lightning strikes notwithstanding.
First off, most people engaged in 'future trend domaining' as a practice are almost always fundamentally lousy domainers to begin with. As is the case with everything else, fundamentals are what puts points on the board and dollars in the bank, before exotic practices are ever considered. Future trend domaining is a hugely fringe practice, like the guy who spends all his time on the basketball court lobbing full court bombs, but cannot make a lay up. There may be a time when that esoteric skill is needed, but he's not somebody who's ever going to start a game. That's what we see here. A bunch of guys who cannot make a layup, so they think that trying to become a full-court-shot buzzer beater 'specialist' will maybe get their name on a jersey
It's just a dumb strategy.
As expected, he best 'future trend domainers' are almost always the best domainers, period, no different than NBA teams don't need a 'full court shot specialist' since they already have a roster full of guys who don't need to specialize since they can already shoot everything else.
By the time the 'future trend'ers' come along spastically registering worthless domains, the small handful of domains in that niche that are worth anything are already taken by people who succeed at buying and selling the types of domains the 'future trenders' do not own, nor can they afford, yet these people come along and beat 'future trend domainers' at their own game, before it even starts.
Just like everyone else, I too had a time when I was starting out and registered domains that were a mistake. We all did. The difference I see in myself starting out years ago and shitty domainers now is that I aggressively pursued refinement in my strategy so it improved towards profitability. I studied, I learned, I listened. Few, if any of these people, are doing that. They're just wasting a few hundred, a few thousand every year, casting their fate to the randomness of 'the future' and hoping the winning lotto numbers come in. Not helping this is the sad fact that there are a lot of people who love hearing themselves talk, who are absolutely, positively NOT worth listening to in general, never mind taking advice from.
The whole 'future trend domaining' trainwreck we see so regularly on display here is a losing strategy and frankly, whenever you're openly and notoriously doing something dumb on the internet, eventually, someone's going to come along to point it out, even if it hurts your feelings.