For a company ( AMK as an example ) to re-produce every example of each different bolt head marking on each and ever bolt size / dimension. Would be economic suicide .

I can think of at least 5 or 6 different head markings on the underhood electrical fastener alone. Another one would be at least a half dozen different valve cover bolts.
They did the right thing,, pick one maybe 2 in some examples and go with it.

I for one and dmmm glad they've stepped up and have done what they've done