Really? What routes are you flying? I don't think I've flown a third as much as yourself, but I definitely have lost multiple days over the years owing to missed connections linked to mechanical difficulties. I just lost 2 days flying in and out of the Philippines on PR- one each on the outbound and inbound owing to mechanical difficulties on their Q300s. On the inbound flight, they didn't even bring me to the airport I booked for in the end because they didn't have a plane small enough to land at MPH (Boracay).
Asia up to 8 x per year, Europe x 4 per year and 80 CDN/US flight per year. I will add you to my don't fly list too. My longest mechanical delay was a 1/2 day in Hong Kong. All other mechanical delays have been next flight or aircraft change. Maybe I don't have these problems because I don't segment fly.