Nothing wrong with the firepower on that.
I think they get Flanderized a bit in this regard. My view is that they prefer technology that has reached maturity. If interface systems could get to a point where a pilot could get a few good years in (maybe five to ten) and then leave without suffering permanent mental damage, I think the Dominion would be much more open to using it. As you point out, the fact that they are practically developing a retirement program (they pretty much have to for the KungsArmé forces) rather kills their employment of most EI systems as they are now. Honestly, I think it more likely they'd start using C3i again before Interface becomes widespread.
If Interface becomes more widespread in the other IS Clans, I would honestly see them heavily using C3i and TCs all over the place before they move into more EI territory. Those two things (combined with doctrine that makes full use of them) could help keep them on equal footing with Clans using Interface technology.
Always remember with the Bears they have been given a lot of advantages so they need to be gimped in others.
TCs are problematic for weight reasons and we already see their use in intelligent places in the touman.
WoB iC3 saw ECM spread liberally around the Sphere. To the point C3 isn't standard DC equipment now. Plus it doesn't work with stealth tech if we are going that way.
Interface Cockpits are that revolutionary. You get better pilot performance. And your Mech gains 4 crits and 2-4 tons. That pays for Ferro Lammellor armor in most cases. (FL is situationally better than FF.) Look how it changed the Viper. Now do that to every light Clan Mech in the game.
There are tactical fixes to Interface Cockpits and there is a cost in pilot lifespans. But there are ALWAYS young dumb patriots willing to pilot things like this. Heck. There is not one ex military person that I know that isn't carrying a long term injury. It will happen. It is just a question of when.