"Military Grade" means the military put out a requirement for [fill in the blank] specs, then bought from the cheapest company to meet those bare minimum requirements.
In order to win a government contract, you need to be the lowest bidder, full stop. So companies will take all sorts of shortcuts in order to make their product cheap while also meeting the specs required.
So yeah, "Military Grade" means cheap garbage that met some generic spec requirement the military once asked for.
Sincerely,
~Former military dude who used to manage equipment orders for military units.