Spraying of the light can be misleading. It's not as bad as people say it is.
If you measure the position of the fillament of regular H7 and compare it to the capsule of HID w/ an H7 base, you would find that the difference between the distance from base to fillament/capsule is .05mm, a negligible difference. This is regular light physics and optics. if you change the light source along the axis, the angle of reflection would also change. in this case, it's not a drastic change.
Compare the H7 bulb to what Honda uses, 9006. this distance of base vs fillament and base vs capsule is off by about 4mm. So the glare would be more obvious.
However, since the lights ARE brighter, it is brighter for drivers on the other side. Solution? If you're the driver on the other side, don't be like an animal and stare at the light. DMV Handbook tells you to look towards the lower right side, not directly at it. I also never heard of any accidents happening because of that.
Also, another reason why GTI's glare won't be as bad, if you look at stock halogens, there's a pretty good light cut-off. the cut-off for HIDs will be close to that.
Need proof? I'll post pics of my HID vs halogen in driver side for comparison purpose, and I won't adjust anything.