Our policies aloft are grey(er). Though staff are encouraged to not employ opposing motions (i.e. saw to ground - hand to sky). This is a hard habit to discourage with top handled saws.
However; on the ground I enforce a strict policy of leg lock or ground start, notwithstanding a flooded saw.
My career evolution started from the far side of the safety/arboricultural spectrum (no hard hats, no saw pants, free climbing, spur to prune and drop starting) and over 20 years has moved to the opposing side of the spectrum with good mentorship.
At the point when I became a mentor myself I chose a strict non-drop starting policy on the ground and i quickly observed that there was ZERO loss in productivity, yet an increase in percieved professionalism by co-workers and clients/observers. Some occasionally making comment that they had never seen such a safe manner or care of operation. Quite the paradigm for a residential customer to express!
Additionally - when teaching i found a manner of defense which seemed to be logical and readily accepted even by opposing perspectives.
Goes like this:
X = equals successfull ignition of saw
Drop starting requires -
A (R arm back)
B (L arm down)
C (L wrist resist rotation)
D (L arm out and away from appendages)
Therefore X=A+B+C+D
Wheras leg lock requires -
A (R arm up)
B (L arm locked straight)
Therefore X=A+B
By simple complexity of equation the leg lock method is safer.