It’s not that each faction has no access at all to the other dynamics, more that it’s not their forte.
I think reactive Vs proactive is more “Punishes the runner for doing something”, which traps do by default, but also cards like HHN, Barry the total prick, and others. (I recently got got by him, so I’m upset.)
Conversely HB and Weyland just attack you in a more general sense. Condensing the amount of clicks you have, it just making you go Boom.
Now each faction has access to other methods of attack, NBN can just Close your Accounts, and Weyland can Force you to Connect, but their main themes are directed in one place.
But I think that’s one of the problems right now. CI is a deck that is proactive, and so good at what it does (/did) that it’s really hard to beat. NBN is the biggest challenger to the mantle of Best Deck (IMO) in this new world because whilst its heart is in the reactive style which it does absolutely incredibly, its out of colour effects are actually good enough to see play on other factions. A click to make you lose four money for almost no work? Say no more! Couple that with the fact that the new identity is in part a reactive effect that requires the runner to make specific plays, but the payoff is higher than it might be of it were a proactive one. (Compare it to the HB identity that rotated that I never got to play.) Suddenly you have a faction that does its own thing very well, and can also be proactively disruptive. HB was linear and powerful, which people hate, but NBN does everything, which I think people hate more.
I’m probably massively overselling this NBN problem, but if I can win with a deck it must be good.