Good, I've lost most of the faith I have in my own country to help make the world a better place. The EU is the work in progress vision of what the world should be striving to emulate. Why shouldn't it be a preeminent world power?
Well, the last time that happened wasn't exactly a crowning success, and led to most of the problems the west is still facing.
Granted, Europe wasn't in a union then.
Germany has 2 strikes on its record (WWI and WWII). Last time they avoided complete deindustrialization and a complete destruction of their economy post WWII because the Western Alies wanted a counter to USSR's influence in Western Europe. Strike 3 could be out for Germany this time for real. No one forgot WWII and what happened back then.
You apparently forgot the tiny little bit about not wanting a WW3, which led to the decision to not repeat the mistake of WWI peace treaty.
But even then, what exactly would you suggest should happen to Germany? Simply for the US to annex them? Given the fantasy world you live in, I'd guess that'd be it?
Unfortunately for your arguments, if the EU actually claimed sovereignty in any shape or form it would not have US troops and nukes on its ground. And Germany as the industrial base would have 0 USA troops, tanks, troops or drone bases. As history showed us, the most important issues are solved by blood and iron, as Bizmark once said. EU has 0 sovereignty as long as NATO exists.
What does this even remotely have to do with what you're replying to?
On topic: while I'd welcome a stronger EU military collaboration, lots of the common projects (e.g. Eurofighter, that transport helicopter and so on) were utter failures IIRC, both on costs/delivery time and performance, so...