In an ideal world
I have no argument regarding all previous posters.
Correcting altimeters for cold temperature is necessary.
So why don’t all airport approaches that experience ISA -15°C and below publish a corrected MSA?
Is there a chance that the “fat” in many procedures cater and cover many low temperature scenarios?
What about altimetry system error?
What about temperature inversions?
It does not absolve your responsibility to check but would everyone agree that when you correct every crossing altitude homogeneously in a non homogeneous environment it is a little like spinning the wheel of fortune.
Say you’re shooting an NPA to minima and you observe you’re getting high. What is the necessary correction and how long will it take to correct? Suck it and see right?
Also most platforms must contain a certain level of fat ref obstacles because we fly level into to an approach path ie it is not normal practice to intercept a glide path from above?
I’m curious how many correct platform and all subsequent altitudes and how many would delay final descent point from the published platform if terrain wasn’t the issue?