How long term reliable is the MT09?

We have a good amount of data on the Yamaha MT-09’s long term reliability as it has been on the market since 2014. As a performance oriented bike, owners and potential buyers love to talk about how the bike holds up over time. Of interest are durability of the engine, common wear items, electrical system reliability, and how well the bike holds up to high mileage. Some discussion goes toward how to compare maintenance costs versus other bikes in its class, as well as what model years are reputed to be the most reliable. High mileage owners are particularly valued, and comparisons to the reliability of other popular naked bikes.