To be fair to the argument, it was also about the sheer amount of numbers we would have encountered as well.

They are complex machines, we pretty much stayed with our vehicle for quite a length of time and would understand it's nuance's, what would break, how to fix it, a good tank crew could strip down the pack (engine) for a lift (removal) in a short space of time.

The spares backup will be another big problem in Ukraine, these things break down a lot and without a decent quick supply chain, it will also add to the woes.