Umm... only one problem with that. Plutonium. You can use it to make Radio-Isotope fuel, or you can use it to make MOX fuel. Pick one. So, either you can get 1-16 EU/t 'free' or you can quadruple your EU output from your reactor. Umm... I don't know about you, but I'm going to go for 'quadruple my reactor output'. Well, as long as that doesn't break the 2k barrier.
If you're running a UU station, the MOX is the right call. Most other things, the Radio Isotope fuel is right. MOX fuel makes reactors very efficient if used correctly.
And MOX reactors just flat-out perform better on every metric. In fact, to make RI Fuel, while your MOX Reactor is going, you're actually going to need to have a spare reactor running full-blast just to make the plutonium necessary to MAKE the RI Fuel.
You can do that.
I mean, sure... you can do that, but where are you going to PUT it? You've already blown the top off of your power cap, which means it needs to be on a completely different system.
It's cheaper once you have the fuel to use that to power your factory and other things as opposed to stepping down your reactor. Replace your old infrastructure.
You can't spam those because it requires multiple cycles from a full up reactor to get enough Plutonium to make enough RI Fuel to get ONE RI Generator cranking out 16 EU/t. Multiple cycles. At two real-time hours (and change) each. That's an enormous time sink there.
It's like one or two evenings chunkloaded. Or a week of reasonably dense gameplay if you aren't good at automating. And unlike Thaumcraft's time assassination minigame, you can do other things.
Say you've got MFSU Carts carrying millions of EU each running halfway across the server via some sort of portal system. However, the limitation here is the EU/t it can load and unload, which is 2k and change. Even if you had an MFSU Cart hitting the Power Unloader flawlessly without a single tick wasted, that is the maximum amount of energy you can transfer. It doesn't matter how many MFSU Carts you have in the queue, they simply won't unload faster than that.
You can parallelize this max load and diffuse it throughout your base. Very few things take 2048eu/t and those things can be near your reactor.
Yes, you can move stored energy much faster, but you can't get access to that stored energy any faster, and you can't load it up any faster either.
It doesn't matter though. You're really mad about this, but since nothing individually can consume it and it's trivial to parallelize, why does that matter? You're mad a theoretical consumer that doesn't exist can't be fed over a speed limit.
The new ic2 meta for nukes is this: if you go over 2048/t you've done it wrong. It goes boom. Design accordingly?