IO540 and SS
I feel you come from different view points. SS maybe that of an instructor and IO540 the instructed.
There are some excellent instructors - I have come across a few who have a very good understanding of aviation law, never mind the experience to instructor at a very high standard. Sad to say that is not my general experience nor the experience I find of most other pilots.
As with any exam based instructor qualification of course they have achieved a minimium standard but equally that does not mean they have the same in depth knowledge of many of the contributors on this forum.
The debate about the IMCR minima is a case in point where even we cannot agree on the correct interpretation (although I am in no doubt they are recommended minima).
The fact of the matter is that there is a whole bunch of instructors who are far less experienced than many on this forum - IO540 is quite correct.