Mine were positively dangerous! If you're on and off the main beam yes I'd agree, but if the 'bulb' cools down it takes time again to warm up ...
i don't really understand the "dangerous" bit, even if they take as long to reach maximum brightness as you've experienced.
i'm failing to think of a single example where that could be dangerous

example: a country road at night.
you'd either be driving within the capabilities of dip, so no problem, or going fast enough to need main, in which case the dangerous bit is when you switch to dip for an oncoming vehicle. since main was on only seconds ago, it will come to full intensity immediately.
for it to be a problem, you'd need to be riding on the limits of dip for a long period, then very suddenly have to switch to main for some vital reason that eludes me.
i don't count flashing other vehicles as vital.
i'm mystified. done thousands of miles on HIDs without slow main beam ever giving me a problem. yes, it would be nicer if it was quicker sometimes, but hardly dangerous. give me an example.



I'm trying to prevent people making a mistake that could be very expensive to repair.
so had the dip set a bit lower than I'd like, but the 800's dip and main aren't independently adjustable so I'd occasionally like to throw a beam into a dark corner just to see what was there ... Remembering how the RT remained virtually horizontal irrespective of how hard the brakes were applied - I rarely needed main then as the dip threw as much light as I needed up the road.
but that wasn't the intention of the loom, it was to avoid the voltage drop they get.