Some stock reflectors do well with HID lamps and some do not. If my HIDs were bothering people, I would take them out. I have adjusted and checked the beam pattern to make sure it is not bothersome and have had no oncoming vehicles flash their brights at me.
The main reason I use HIDs is for use with heated gear. They draw less power, allowing more for heat, and they are steadily bright from 9V-16V. My heat controller that turns the power on for a variable fraction of each second made the halogen lights look like they were modulated, and badly.
I know they are not legal. Neither were the halogen lamps I used in the 1970s when sealed beams were required but legal lights back then were terrible.
in order of ownership
1971 Honda CB350, 2 1973 Honda CB500s, one was stolen, 1974 Can-Am 175 TNT, 1978 Yamaha XS11, 1978 Honda CX500, 1975 BMW R90S, 1983 BMW R65LS, 2005 Suzuki DL650 totaled, 2007 Suzuki DL650A, 2012 Suzuki DL650A