Do you trust your local watchmaker?

[Statuswan]

Hey guys. I have a local watch maker that services my more "basic" old school watches with ETA movements, and he does a pretty good job from what I can tell. But I also have some watches with newer type movements like my Yachtmaster 37 with the 2236 syloxi movement and a Bulgari octo 191 movement with a ceramic ball bearing winding rotor.
My question is, are these modern movements much different in terms of a"clean and oil service". Or are they so different that old school watchmakers shouldn't be touching them? I've asked him before and his reply was "movements are like car engines, they're all relatively the same principle". What do you guys think? Thanks!