Not all altitudes from the IAF but below the temperature corrected MSA needs to be corrected (in our company at least, EU OPS).
A good point. No point correcting altitudes that are for ATC procedures rather than terrain clearance. Again the simple point here is that you are going to be lower than you altimeter says you are, which should make it obvious when you need a correction.
And you mean a
t° corrected MSA right?