All this does is finger the blame
No it doesn't it's called taking responsibility.
If I replace a Rudder Travel Limiter Actuator, (as it's a popular subject) I sign for it in the appropriate paperwork, I take the responsibility. If I open the engine cowls to replace the IDG I take responsibility. I follow the procedures and making the appropriate tech log entries. Opening and closing the cowls is part of that procedure. If I don't follow the AMM and the company policy then I'm breaking the law - simple.
If there's an entry in the tech log that refers to the cowls being opened when reviewing the tech log the pilots can easily see what work has been done and have a good look on his walk around.
Unfortunately basic airmanship has been forgotten about in an effort to drive down costs. Fewer staff, less qualified and less experienced.