More advanced genetic engineering is one thing, but suddenly introducing teleportation and psychics seems to be against the limited superpowers premise.
But they're not "suddenly introducing teleportation" - Dr. Manhattan has demonstrated that teleportation is possible; Adrian just finds a way to do mechanically what Dr. Manhattan can do with his own mind.
By the way, I really get a kick out of the fact that in the Watchmen universe, the arguably most powerful being in the galaxy is named Jonathan - even if he insists on spelling it without that first "h."
But they're not "suddenly introducing teleportation" - Dr. Manhattan has demonstrated that teleportation is possible; Adrian just finds a way to do mechanically what Dr. Manhattan can do with his own mind.
Copying Manhattan's technology to make big bombs is not really a new development - the world already had plenty of huge bombs.
Making teleportation devices, OTOH, is big deal, since there aren't really any close substitutes. It doesn't take the world's smartest man to come up with sticking weapons in the teleporter.