I got my training in northern CA, and yeah, there were some big trees that got spurred and not removed. But even back then our company took great pride in our ability to handle any tree spurless if that was what was required.
The down side to the ease and efficiency available, with our modern ropes and tools, is that highly-skilled spur work is becoming even more rare than it already was. It is a shame because if you ever see a guy that truly has mastered spur work, you will see speed and grace of movement, combined with reduced effort and safe work positioning. Spur work is fun and should cause no more foot pain than a day hiking in the mountains.
Dave