As far as I can tell they're important for night-time off-roading only. Similar for the mega high beam downhill mountain bike headlights. But in both communities, there's no shortage of assholes who just love their billion lumen fuck you lights. Cycling against bike traffic during bike peak hour on say the Scotchman's creek trail is fucked for the high beams. But no one gets in trouble for it, so people do what they want. Driving round in the bush these days I no longer dip my lights until they do, I used to try and do it as I saw the glow of oncoming headlights so I was never actually beaming anyone but people mostly just seem to leave their high beams on.
TLDR: malakas