Yep, my Hope V4 is bright enough on the back unlit roads to make most 4×4 drivers slow down to a crawl if needed.
No more directed at you than anyone else with off-road lights used on road, but a similarly bright/angled light would be an MOT fail on a car due to the risk to other road users. 1000 lumens at that angle is dangerous. Even some rear lights are a bit ott in some settings too, but dangerous? No.
So I return the favour and stick my lights on high beam the same as if they were an inconsiderate motorist.
Fair enough. It’s a bit worrying when I get full-beamed when using just a 300 lumen torch light but if you lean the bike up with the light on, crouch 30yds in front at driver height, it’s quite dazzling. As GrahamS said about reflectives recently, it’s a useful thing to do.