Mind Maze is great and available to all Shadow specs, no one is debating that; we're talking about how relative trash the deep Infil spec is, even more specifically when you're in BM gear - what I've been saying since December, you know that sick Force Breach damage you build up 5 stacks for? Operatives open with that damage and don't need stacks, just stealth, I have an Operative and you should roll one as well if you want your own comparison between Inf and Concealment/Scrapper. Even more so now with the buffs to the other trees and nerf to hybrids, why do you think there are so many 31/0/10 PvP streamers/vids going around?
I would love if the scenario you described is how actual fights go down, I don't know how one can screw up, combat isn't exactly fast-paced, resolve is simple, and learning the basics of a given tree doesn't take long, the higher skill cap really comes from knowing the other classes and their debuff/buff effects and graphics/icons. As Kinetic I have SO MUCH leeway against BM yoyo Assassins/Shadows it's not even funny. And I haven't even begun to talk about the superior utility and survivability offered by the other two trees. tldr; the deep Infil tree/Shadow Tech sacrifices a lot to do a little more damage.
One of the most naive things I've heard all month. I'd quit the game if I ever got killed by a lone Sniper in their current form.