Doge some good points, thoughts. My tendency is to spin, that style is heavily ingrained. I'm currently faster at 90-100 rpm over 20K than at 80-85. Ask me to do a 5m max and I'll self select closer to 105-110 rpm. That has not changed from my 20's. I've always felt very strong on 165's on the Track. Add to that a fitter I trust observing that I'm smoother over the top on my road bike & suggesting the change.
Worked a bit with stomping the pedals more last summer. I could make it work (better with Q-rings) but was marginally slower testing & had some knee discomfort. Not sure if that's something I would have worked through but did not want to take the risk for what seemed like little to no gain. That kind of a style change may be tougher for an older rider than younger. So much adaptation has take place.
Should be interesting either way.