As a counterpoint, I think the quick tool change is the better option — if RPM comes into play for an operation, it’s just a matter of balancing the feed rate, worst case is you wait on the machine. I’m pretty sure if you calculate the time saved in feed rates it pales in comparison.
For tool changes, the quick change is faster, and my philosophy on a CNC is I have one because my time is more valuable than the machine’s.
(Yes, I really want a Mafell quick change spindle, tool changes are an interruption of my watching the machine and checking in on the help queue and so forth)
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