It doesn't really matter that ESFs were "glass cannons" if the things that are supposed to be shooting at them, namely Skyguards, are loaded with cotton balls. In other words, "glass cannon" is a relative term. And ESFs were simply not dying very much to AA, especially dedicated AA units like the Skyguard. I think the nerf was very appropriate. Now a single ESF can no longer effectively engage and kill a single ground target... just like how a single source of AA could not effectively engage and kill a single ESF. It seems pretty fair to me. ESFs should have to group up in 2 or more to stand a reasonable chance to kill anything on the ground, just as how pilots have demanded that AA group up to take down a single aircraft.