If my car fails while I'm driving over the mountain in the winter and leaves me stranded outside of cell service in sub zero weather, that would be a critical situation.

If my car fails while I'm driving through the desert and leaves me stranded in 100+ degree heat in the summer, that would be a critical situation.

If my car fails while I'm driving on a busy part of I5, that could be a critical situation.

I get that the rolling coal mods or whatever aren't designed to improve reliability, but things like deleting EGR or modifying the control logic for the DEF system are and can prevent a vehicle from failing in a situation that could be life threatening. Again, the government already knows this which is why they order their vehicles with those exact modifications already done.

Honestly, how do you know? Regardless, it's completely unfair. The government knows emissions control tech takes one of the most reliable workhorse powerplants in the world and neuters it, weakens it, and makes it more susceptible to failure. A lot of folks delete their diesel trucks not to "roll coal" or own the libs, but because it makes their vehicles more reliable.