For routine performance work, the work is relatively straighforward and the ops engineer doesn't need a great deal of anything other than
(a) a good understanding of what he/she is endeavouring to achieve
(b) good housekeeping and general attention to detail.
What is a problem is the (generally) pilot who views the work as being a lot more simplistic than it is. Perhaps this sort of view develops as a consequence of using the typically very simply presented RTOW tables in routine line operations ?