(not to be rude, exaggerating for the point)

Fuck yeah it is, are you joking?

If you ever think the conditions are too dangerous to drive in then you slowly pull over off the side of the road, you don't block it for every other vehicle. Blocking a lane is exactly how you cause accidents.

This is just some egocentric shit.

How can this not be a problem for emergency vehicles and other cars in severe weather

Yes, it is bad.

Road is critical infrastructure & you arent the only user.

Yes, this is a bad thing. As you said, visibility is poor and then someone comes to a dead stop somewhere in front of you on an interstate or someplace where you don’t expect stopped traffic, that can also easily lead to a crash. In the event of heavy hail, you are supposed to slow down, not stop, try to use the exit and take cover in a safe place, preferably not in the flow of traffic.