I agree that pinning the needle settings can cause some issues. A factory worker in China is probably presetting the needles using vacuum or pressure reading equipment. That's okay for their altitude, humidity, etc. However it may vary anywhere else. The engineering premise of presets and limiters is a good one, just needs some refinement.

One newbie here had a hard time with his, kept quitting in the air after a brief run. Another fellow changed his glow plug and the problem went away. Newbie didn't know a plug could do this.