vhatever:
Not one Throw. One POINT in Throw. Altogether different. One point in Throw allows you to lock down krogan who don't have defenses. They don't stand a chance. There's no chance of mistake. If he loses armor, he's dead, very simply.
During the first half of the game not all the enemies have defenses. This is particularly true of the first mission and Freedom's Progress. If you don't believe me, then play it again and count. I assure you, they are there.
I don't know how Insanity plays like. It may be as you say. However, I won't say you're living in a fantasy world just because you don't share my observations.
Heiro Glyph:
I don't often find myself flanked, and when I did, Tech Armor did not save me. Generally, when I'm getting swamped, I'm using powers, so reactivating Tech Armor is a lose-lose situation. Either lock out your powers for 12 seconds (which is a long time in combat), or lose your shields. It's not much help, in my experience.
Against a krogan in close range, Throw is better, because it locks down his offensive abilities, and it does allow you to get away. Tech Armor? Maybe, maybe not. It's not as good in that situation. Krogan are especially vulnerable to this as they rarely keep to cover. Warp-Warp-Incinerate to kill his armor, then Throw to lock him out until he's dead. Within 9 seconds, he's rendered ineffective. Very powerful. Of course, both Adept and Sentinel have this combo.
What the Sentinel does not have is Pull-Warp. Strip the defenses, Pull up, then Warp. It creates a 5 meter explosion that affects everything, defense or no. Very strong. Mooks are good for this as they usually get stripped of defenses with one or two applications of Overload or Warp. Use your mates, then set the explosion.
Again, don't take my word for it. Go ahead and try it out.
For my bonus power, I took Energy Drain. I find it strictly superior to Overload in most cases. Whereas Overload is more useful on synthetics, and locks out enemy fire for 6 seconds at higher levels, Energy Drain restores Shields on all levels. Better than Tech Armor + Capacitor Chest Plate.
In fact, I'm playing Sentinel and Adept very similarly. Overload/Warp/Throw on one, Energy Drain/Warp/Throw on the other. It's remarkably similar. On Sentinel, I get Tech Armor, too. On the other, I get Singularity and Pull. It's all good.
You can do the Pull/Warp trick on a Sentinel, too, if you take Jacob. I find myself doing that a lot, actually.