Another consideration is the differences in fuel between where the saws are tested and where the saws are used. It was rumored that Stihl is in the habit of actually importing our crappy ethanol laced fuel over to Germany for the larger models built over there, for the sake of tuning the saws for what they will be run on. I have not heard the same for husky. It is my guess that the saws run appropriately there on whatever fuel they are using to test them.
It should be noted that the instruction manuals all say that they should be properly evaluated by a servicing dealer and tuning should take place there as well. I realize that this doesn't happen at the big box stores.
I think as autotune and similar systems become more widely available, this will all cease to be an issue, and for that, everyone can be grateful.
When you take into account fuel, ambient temperature, elevation, mix oil, there is a lot that can change between when the saw is set up at the factory and where it arrives.
Remember that ethanol fuels do run leaner versus non ethanol fuels.