>>4397835>If you have electronically controlled timing, you're not wearing it down with every use. The timing is always accurateUp to this point you were 100% correct. Even with cameras that have shutter electronically controlled there's always the mechanical part as you written that gets used, dirty, grease solidifies etc. over time.
The biggest problem with cameras any construction is springs that power movement or control return of elements. They are non-serviceable parts and very often making replacement is very hard or undoable because there is no technological data of their characteristics. Still you can experiment with their strength to match the timing. Cogs and sprockets can be easily made either with sóyboy 3D printing or with chad machining. You can even cut them manually from brass like watchmakers were doing for centuries. Even things like cams that there is no data regarding their original shape can be reverse-engineered from desired camera characteristic like for example cams in rangefinders - match the focus on infinity, 10, 5, 3, 1 meter and done. With electronics, either based on dedicated microcontroller, or long gone source code to progam those generic you're pretty much left with finding donor body. That's the case with my Olympus OM-2n that second year passes as I'm looking for donor body for the board.