You're still insisting on that a GM never uses a lowered threshold, though, and that people never mod their vehicles.
When I can't think of a situation in which I wouldn't lower the threshold values (because they seem pretty universally off), this reduces to "The rules give you permission to modify them as you see fit." Which is I think should be called out as awful game development. There was an opportunity to do something about it Double Clutch, but it wasn't really taken (although I've not taken a good look at the actual values in there, maybe it subtly lets you ignore the CRB?). I will accept systems that are not particularly to my taste, but I'm very intolerant of the actual math not giving sensible results when you use the system as described. If I ever have to run vehicles in 6e I'll houserule it, and it won't be very difficult, but given that they messed up numbers with vehicles in 5e it particularly irritates me that they again didn't think through the number in 6e.
So yes, I will point out the flaws every time that somebody has issues with this system, thanks.