Yes, I've been in a few of the older semis and visilibity is lacking, but your loking out and over, not up and over. Even with the old school high hoods on semis, you still have a good field of view straight ahead.
I haven't been able to read the final revision of the NC law, but it's more than just visibility that they're after from what we're told. The headlight level tolerance has always been on the books and is part of yearly safety inspections here. That was imposed on lifted vehicles years ago and it makes perfect sense. That's why semi's headlights are low on the bumper. I'll be more than happy to share it here once we get a copy of it and I'm expecting it anyday now.
With the amount of geometry change to the vehicles in question, there is an insane about on unnecessary stress on critical suspension/steering componets that increase the risk of crash and rollovers well beyond 400% let along premature failure of the previously mentioned components which circle right back to another predominate cause of loss of control.
Just the other day here, an individual was traveling straight and within the posted speed limit (45mph) on a pretty busy road. Lower balljoint gave way and the truck spun out and flipped several times. Driver was ejected, vehicle slammed into 2 nearby vehicles injuring 2 in one car. The other vehicle suffered one critically injured and one fatality. Vehicle in question was a late model Tahoe. 4" lift in front and right at a 3" drop in the rear. So clearly, the law is being geared towards altering vehicle stability as well. Had it been closer to factory height, the rolllover part could have probably been avoided and the inuries could potentially be avoided. Yes, I'm aware unmodified cars and trucks have the potential to rollover as well. Not trying to sound like I'm disagreeing with you to act like a keyboard warrior, because I'm not.
Merely stating what we see here in NC on a daily basis.
About a year ago, there was what we call an "extreme" squatter. Driver of squatter went through a double turn at an intersection. Due to the amount of uneven lift, his steering radius was very limited. He couldn't make the turn and ran right up onto a small car. Car's battery lit off and guess where it was sitting? Right below the squatters fuel tank. Yeah, that was a rather large roadside BBQ that day. Fortunately nobody was injured.
In the end, I'd never tell someone how to spend their money, unless they're directly linked to my account. But when you get to a point such as we've been discussing, there is absolutely ZERO benefit for squatting a vehicle. You're losing a ton of visilibity, stability, and most importantly safety.