I know very few owners who, like me, keep their log books themselves (which is why so many aircraft have incomplete history because log books fail to be transferred, 8130s and Form 1s are lost.....) and even fewer who are competent enough to understand what is required.
Not my experience. In the US, owners of light aircraft create no 'Approved Maintenance Plan' for their aircraft and there are no CAMOs, either... Nobody would have the foggiest concept of why either is necessary, and instead they get involved with their aircraft, getting stuff done as needed in real time. Everybody keeps their own logbooks - I get very nervous if for some reason a mechanic wants to hold mine overnight, although with trusted people I have done it.