Auto lights (not high beam assist) has been around for literally decades and in my experience, it doesn't cause an issue if the roads are too dark, the lights will just come on and stay on - when the systems first came out, if you drove under an overpass the momentary change in light intensity could trigger the system causing the headlights to flash on & off, which confused some drivers and the solution to that was to build a time delay into them, turn the lights on immediately, but hold them on for five or ten seconds. It's now what I would call tried & proven technology.
High beam assist is much newer and part of a suite of features known collectively as ADAS or Advanced Driver Assist Systems, the intent being to make motor vehicles safer, but I feel it has the opposite effect. The technology to a large extent is unreliable, and whilst it is optional, if the manufacturers don't fit it, they end up with a lower NCAP safety rating and lose sales to brands that do. As mentioned earlier, even if the high beam assist switches to low beam suddenly the lights should not go out, I understand it can be disconcerting, but it is what it is. Presumably you still have an option to manually select low beam - the turn signal stalk should have three positions, so to speak, front to rear, furthest away from you is high beam, mid is low beam, and toward you flashes the high beams - what happens if you drive with it in the low beam position?