I had a lot of two stroke street bikes with oil injection. It's coming back- recent KTM and Beta enduro bikes have it. The Yamaha ones used both rpm and throttle opening to detemine oil flow. So it would be economical on oil in eas riding situations but still provide plenty when operated at WFO. The first time I did a track day on an RZ350 with the oil pump it went through a lot more oil than I was expecting.
Saws are made to run at WFO. Partial throttle operation is not important. So that advantage of oil injection is wasted. The oil injection requires a pump, an additonal tank, and some lines. Easy to add to a motorcycle, not so easy to add to a saw where low weight and compact size are vital. And it adds to the cost. So I do not expect to see it on saws.