I think the people who don't trust it just don't understand the difference between 'being illuminated' and 'being dazzled'. Just because vehicles in front can see your headlights doesn't mean they are being dazzled by them.
I understand only too well that main beam = being dazzled, even if the main beam is behind you - do you drive at night very often ??
Yes, every day at the moment. And I'll reiterate - just because a vehicle is in front of you doesn't mean they are being dazzled. It depends how far in front of you they are, what height relative to your vehicle and what horizontal offset. Main beam only dazzles those directly within its coverage area. If a vehicle is more than 150 metres ahead the driver will not be being dazzled.
There's more information
here.
As that document suggests and as various searches on Google show high beams typically only illuminate out to 350 ft or so (~110 metres).
Also
here.
"While high beams help keep you safe, they can also endanger other drivers if you use them incorrectly. All states have laws requiring you to dim your high-beam headlights whenever there is a risk of blinding other drivers. The exact distance varies from state to state, but typically, high beam headlights must not be used within 500 feet of an approaching vehicle or within 200 or 300 feet of another vehicle you’re following."
The 500 ft of an approaching vehicle is probably to allow time for the driver to react and dip the lights rather than dazzling the oncoming driver earlier.