That sort of "limiting" will only hurt us. More appropriate would be to aim for the "lower limits". Like, what is the slowest you can fly? Well, then lets go to the limit speed. What is the most distant alternate? Well, then lets fill her up so we have a reliable alternate. We have to stop for furel? Sounds good. Slow down, make sure you get there and turn into a pumpkin. I'm sure there is a fresh crew in HK ready to PX out to pick up the plane.
As long as people keep doing favors, the limits will only get stretched further and further. Now is the time to show a little union support and slow things down a bit. Send a message.