Depends on how you use your car. I travel long distances in very remote areas and am very invested in knowing that my mechanic has done their job well. I really don't want to end up on the side of the road waiting potentially days for somebody to come along and rescue me.

If somebody is interested in how things are being fixed, then it's a great idea to indulge them, they can be your greatest aid in solving other problems in their workplace so they never get to you.