If you have an object that's planar within tolerance but on some slightly angled plane, I'm not really so sure that making a world-axis extrusion from that really fully fixes the problem...

Probably the profile ought to be flattened in that case. But it's kind of hard to do that automatically because the question then becomes how much deviation do you allow before stopping the auto flattening from kicking in. If it kicks in too easily then you can't make something at a slight angle when that's what you actually wanted to do.

I've thought a little bit about having some more information in the properties panel for whether the current selection was planar or not.

- Michael