I'm sorry that the poor descriptions in the tooltips have confused you. This works precisely as designed. The Hindered effect is not considered a controlling effect. Controlling effects are considered to be effects that cause you to lose control of your character's ability to move - things like Stun, Blind, Immobilize, and Slow. When Electro Net is used on you, notice that Slowed and Hindered are separate effects. You can use Force Barrier while Slowed, but not while Hindered. The Hindered effect allows you to maintain control of your character while active, but it specifically prevents you from using certain escapes such as the ones already listed in Electro Net's tooltip and Force Barrier.
Force Barrier is considered both a defensive cooldown and an escape, since it allows you to completely escape taking damage while it is channeled. If you are Hindered, and find yourself in a situation where you would like to use Force Barrier, then you may use Unbreakable Will/Force of Will to remove the Hindered effect. Then you can activate Force Barrier. Again, I apologize for the poor tooltip descriptions in this regard, as Unbreakable Will/Force of Will tooltips do not state that they remove Hindered (but they do).
While I completely agree with you there's still one point where it doesn't work as intended : according to Ghost_Spectre, when in an attempt to use the Force Barrier while "forbidden" by Electronet, the ability is considered as having fired and goes in CD. However, other escapes do not act like this : they are simply forbidden and saved for when Electronet wears off, their CD do not initiate in an attempt to use. Having the CD of Force Barrier starting do not seem normal and is detrimental, especially considering its length.
If Force Barrier cannot be stopped from starting, and if we consider its effect is the polar opposite of Electronet, then Electronet could as well be destroyed by Force Barrier at the same time it cancels itself. Like this, Force Barrier will have removed an hostile effect, and Electronet would have stopped Force Barrier from being an escape.