I mean the plants could’ve also built school busses and ambulances instead of military vehicles, right? I was just pointing out that “no downsides” is a bit optimistic, the costs are very real. And it is a pity that in this day and age we still have to put up with that 🙁

You're not recognizing the reality that existed before this if that is your stance. The plants were already building the military vehicles except those plants were in the USA with the vehicles being shipped to Europe for Europe defense. The difference in this particular aspect is that now Europeans will have a stronger hand in their own defense.