Yeah, I suppose so. The few armor piercing options (rapier, twilight scepter, and the unstable ingot sword) might still be worth it when combating this and quantum, but given that the powersuit doesn't prevent all damage, totally max damage upgraded tinker's construct weapons in general might work alright, but I haven't tested it.
Back when the twilight scepter was the only armor peircing option, and enchanted books didn't exist, the twilight scepter was basically a silver bullet when used against quantum armor. It ignored it's protection completely, so it was like they were wearing no armor at all. The protection enchantment, however, does reduce the damage dealt by the scepter, giving an advantage to players who weren't using quantum, and making regular armor not totally obsolete.
However, the introduction of enchanted books changed this, removing quantum's one weakness and any reason to bother with regular armor anymore. Then Modular Powersuits came along, providing armor that was overall better than quantum, but not quite as protective. More importantly, it can't be enchanted. I also heard that in the latest versions of IC2, electric tools can't be enchanted. I don't know if that applies to IC2 armor as well, but here's to hoping it does. That, combined with the upcoming higher tier of thaumcraft armor that is supposedly going to be in the 3.1 update, and the upcoming Tinker's Construct armor, will hopefully give people a reason to not use Quantum or Powersuit armor. Or at least make it a harder choice. I also heard that Dartcraft armor is pretty good, but I don't know much about how good it is other than that it can let you punch hard, apply an annoying bleed effect, fly for a short while, and make you look like Link/Peter Pan.