Why M60 AMBT has too slow reloading speed?

There are at LEAST 8 tanks (MBT/KPZ-70 family, Leo 2 prototypes, Abrams prototypes) that have better mobility. With guns that still work well, with better/same reloads, and armor that is better, or at least similar. So again, what is so amazing about the AMBT? It can lolpen? Thats great, but you will STILL want to aim at the same weak spots on enemy tanks to: 1. Ensure a pen and 2. Make sure you hit important internals. Anything ive ever done with the AMBT could have been done with tanks at or below its BR.

M60’s mobility, thermals, and round are what’s amazing about it.
Other tanks below its BR have half the pen and no thermals.