as mentioned before by someone, AFMA is a feature to fix canons own shortcomings in the manufacturing process. it should be a standard feature!
Why stop at just AFMA? Everything should be a standard feature on the $649 13.05 ounce camera. Everything has the potential to be useful to some photographer somewhere. And added complexity never stopped anyone from buying a camera. Yep, we know Canon's business better than they do.
Because AFMA is different. It is NOT a feature it is about making a camera not be broken and about making up for QC tolerances!!!!
Something that is a feature is AutoISO. That is something one can argue over and, in fact, I will. It still doesn't work even on 5D3!! Every other maker has it working for years on rebel-like stuff and Canon marketing, after a decade, is STILL slowly dribbling it out even to top level.
If AFMA is about making a camera not be "broken", then photographers have been using "broken" cameras for about 25 years, since autofocus became popular. And yet they somehow managed to make pictures.
1. before digital many people also looked at 3x5" prints which masked lots of errors
2. people have been complaining about poor calibration though and it means sending in stuff for adjustment, sometimes more than once, sometimes being without it for weeks, sometimes it means not having a focusing pair for a nat geo expedition because Canon is too busy fixing 1D3 bodies to care about anything else in the meantime.
3. It costs 0 dollars to put it in the body why the heck are you defending it unless Canon is paying you??
Auto ISO works wonderfully on the 5D3 -- I use it quite a lot. I really don't know why you would buy Canon if this is such a problem and "every other maker has it working".
Unless you need EC and then you are stuck. Note that you can't use Av mode with shutter limit because they locked out all of the shutter speeds that would work for action which is exactly what you need autoiso for!
Seriously with like 2 bytes of changes code (or just a few more if they need to table each allowed shutter speed) it would work but marketing had them cripple it on purpose. Why? For what purpose?