Torres
As usual spot on.
Apart form all of that, it's just smart to get your motorcar serviced at least every 10,000km even if it's just an oil change, and most manufacturers reckon 20,000km is
way time for a
real good lookover.
And that is for the modern 2003 designed vehicle, anything older required much shorter intervals if you were to keep it in good shape.
This is reflected in the maintenance schedules of aircraft manufacturers as the the technology gets better, viz the C208.
Considering a C172 does around 18,000km between services, it's no bad thing to have a good look.
Chieftain = 25,600km, C402 = 28,800km
Point being, if the regulator didn't make it mandatory and 100 hrs = 100 hrs, then most would treat their aircraft like they treat their cars and a drive along any road in town should convince you why that is not a particularly good idea.
And I dare anyone to have issue with the 'but it's different it's not travelling on the roads" and the air is "softer" routine.