This is a prime example why people should not read too much into why the military or LE uses something or refuses to use something.
Maybe it's because I'm cynical but I wouldn't put it past the government to ditch an item in favor of a less expensive alternative and then slander the better one just so it doesn't get accused of giving the soldiers inferior gear.
If they bought the EOTech 553 with the dual throw levers, they wouldn't have to worry about needing a tool to attach the optic to the rail. Of course that's more expensive so they probably wouldn't go for it.
I've had eotechs and never held on to them.
They just never grew on me as you needed to worry about battery life and having to turn them on / off when using and changing the brightness when indoor vs outdoor.
I like the aimpoint comp C3 2moa rod dots, as one battery will last you 5.7years, and also the trijicon acog/reflex battery less sights. They work very well for me and never have to worry about batteries going out, or minute adjustments for different lights with dumb buttons on the front and sides.