I meant that if you intend to use a jammer as a countermeasure against a drone, you're making yourself vulnerable to ARMs. Sure, you can position the jammer away from anything important but that ups your time to redeploy / reconfigure it, reducing its effectiveness. You also lose the jammer, though that might not necessarily be a problem if it's a lot cheaper than an ARM and you have a lot of them available.

But of course ARMs work fine against a drone's controller, too - assuming it isn't using FHSS, though that itself assumes no crazy-advanced anti-FHSS RDF. That's kind of my point regarding how this stuff cuts both ways, how even if a countermeasure works in one instance that's no guarantee it'll continue working, and how countermeasures themselves generally have weaknesses.

Naval engineering provides a lot of examples of this dynamic. Check out what the introduction and development of the torpedo did to the meta.