Jim, I am familiar with Mikes webinars. My recollection is that he recommends "on condition" overhaul or repair when there is a reliable method of inspection, test and or data analysis to determine if a non critical componeent can likely go longer than manufacturers recommendation for overhaul or repair.
Personally (read - my opinion), I don't think "smoothness" qualifies as an inspection or test. Further the Rotax requirements for both the gearbox and carbs are to "check" i.e. inspection. It does not require replacing parts unless out of spec. It is an inspection - which Mike promotes.
Additionally, if any of you have an SLSA, Mikes opinion is that nothing applies except what the manufacturer states. Go here: https://www.savvyaviation.com/home/r...ikes-webinars/ and search for the webinar "TBOs and other maintenance intervals" at 45:23 he discusses this topic.
To be clear, these are my opinions of what works for me, I am simply encouraging other readers to do their own due diligence as to what works for them and not me or Jim or even Mike.
Each of us has their own tolerance for risk and how we approach risk management. Do what works for you, you are ultimately responsible for your decisions!
YMMV, Greg