In my first tries, long ago, I thought nothing of changing only the belt (toyota, pardon my language). On the second change, same car, thought to check the pulleys. Yikes!. From then on it has been WP, pulleys and belt. On those, usually the oil pump seals as well.
Yes, on those CL cars, or any where "my mechanic" did the work, I usually want to pass and go the Texan way.
I had some friends of mine (ex wifes, actually) that had an Outback and "our mechanic". Always complained about what was going wrong, but never caught on. After a head gasket job, knocking a few weeks later, an engine swap, then a seize . . . well, I guess faith can be blind.