Zoomy, not saying you need to sit there for a huge period, but just explaining why the limit exists. The degrading comes through instructors who only care about building hours and not producing the highest standard of pilot possible.
Example, how many people check carb heat by seeing a drop and that's all?
What does a gradual increase in rpm mean?
How many note the ambient MP before starting a CSU equipped aircraft?
How many inches drop from this figure would be normal and how much would be unacceptable?
Mightn't matter in Cairns, but this stuff
will be an issue in Hobart in winter. I will make no apology for insisting my students are aware of these things.