I should also say dropstarting the saw when you’re 50 ft up on the side of a big poplar (or any other big tree) is the only safe way to start the big saw.You do what feels right for you. I always drop started all my saws, especially my 2100 Husqvarna - (no decompression button). Never had a problem with it.
The guys that made the rules about always starting a saw on the ground have never climbed trees. As one of the fellows in our course said: “My arms aren’t that long!”