Its really not that obvious to you? Because not having US bases on site and technology sharing and agreements takes money away from entitlements. France tried to cut entitlements by a tiny bit and the yellow vest movement was born. In the long run the Yellow Vests might end up losing everything as a result.

Regardless of the tech stack the work still needs to be done and now the EU has to do it. The Eu does not have infinite money, in fact they have less than the US so there will be cuts elsewhere.