Indeed it wouldn't be able to stop antimissile-style defenses, but I can see how the main concern here would about not having to worry about Programmer interference. Could be a good ability!
Does seem to have about the right amount of effectiveness to be included alongside the others, although of course this does mean that you'd be that much less likely to get one of the others across a given run, making ability gathering that much less predictable. As is you can get a majority of abilities if you're persistent about visiting as many Garrisons as possible, though if/when we add more it'll become more and more difficult to expect you'll eventually have one or another that you'd prefer.
Not that this is necessarily a big issue since in my eyes the ability system is meant to be supplementary rather than the primary aim of RIF installation, so you just adapt to/take advantage of whatever you get. In that sense just making sure the power levels are all relatively good is the important part.
Will probably do this.