I don't think super weapons should be in the launch version of DU, but in a later expansion, for many reasons.
First of all, I think it should be very difficult to create these weapons if they existed, (possibly a research of some kind?) but for sure the materials to create it should be very rare. For example if uranium was available in the game and was already decently rare, but used for energy production, there could be a special "isotope" of the uranium that could be used as explosives, but is even more rare than the usual uranium. This way not everyone is running around with weapons of mass destruction just grieving. It would take a well-established organization to organize the project/resources to create it.
It could be other weapons than bombs, just using that as an example.
Second thing is, since it's hard to create and probably won't have too much of practical use in the "beginning days" of the official launch of DU, I see no reason that they should work on it before launch and push back the launch further, rather they should wait and add it to a expansion soon after. (in my opinion)
Also, since they'd be very rare, if it did cause server issues, it would only happen during large or intense wars and when it did happen they could just slow down the time for a few moments and then go back to normal.
(Also this is the first time I've really use a forum for anything, so don't bully me lol)