But if your private use Robbie only does 100 hours a year you are still forced to rebuild a half-lifed ship after 12 years? I bet many private owners get less than 100 a year too.
Not necessarily. As private owner you can get permits from the CAA to run it over the 12 years, but they need a maintenance report and a couple of time limited parts replaced. At least in Europe it's that way, not sure about FAA land.