I mean the tanks were just something that we got sidetracked into.
Anyway I did some digging are actual available MBT's are far less than the number: for example out of 220+- MBT's in Storage for UK, only 152 are actually useable right now, the others got cannibalized. France and Germany is slightly higher percentages but also do not have good availability. Italian Ariete's are a wreck at the moment and they're being phased out for KF51 Panthers which haven't been delivered yet. Polish numbers are practically impossible to decipher, mainly because their official government documents only mention buys and there's scant sources on which regiments have been given new equipment and which old equipment has been phased out. Also it's in Polish and google translate/chatGPT isn't doing a good job. Gave up after that.
Decades. And I mean that. It means a restructuring from top to bottom, standardization of vehicle standards, aircraft standards and interchangable spare parts.
As an analogy, European armies right now are like 1943 Wehrmacht. Panzer III, Panzer IV, Tiger, Stug III, Stug IV, Elefant, Jagdpanther, Panzer V, Sd Kfz 234, Sd.Kfz 251, each vehicle with about 5 subvariants and each produced by a different manufacturer with different spare parts and standards.
Air forces are slightly better, with some standardization in F-16's and Eurofighters, but it truly lacks the high-end tech platforms that USA compensates with.
The whole point is from top to bottom European militaries are just really weak.
The only thing it doesn't lack from a pure security point of view is that it's navies are quite competent.