High tech ≠ high heat. It's because saws are still relatively low tech that this correlation remains valid.
If, and it's a big if, you could electronically control a saw engine so that it could seamlessly transition between traditional spark ignition when under low-load and spark-augmented (shock wave triggered) compression ignition when under high load, far less latent heat at full power would be produced due to the almost instantaneous combustion.
But...electric saws may come to the fore before then