New 370Z's 6-spd manuel, weak link???

imag

I assume when skip shifting that you are giving the transmission a moment in neutral to let the revs die down. In other words, you're not trying to speed shift a skip shift (fortunately, H patterns make that inherently difficult).

A correct upshift will not wear the synchros at all. You put in the clutch, put the car in neutral, pause (momentarily) for the revs to drop to the level of the next gear, and engage the new gear. With a light flywheel, there is basically no pause. With a heavy flywheel, and a large jump between gear ratios, the pause is longer. When skip shifting, the ratios are further apart, so you pause even longer. If done right, it ends up just being a nice relaxed (but not too relaxed!) shift.

You know you've got it right because the lever should want to slide right into the new gear. You can tell you're using synchros when you have to press on the new gear for a moment before it "lets" you in.

So you're both right: speed shifting and skip shifting together will damage synchros. Gentle skip shifting should never be a problem.