Lest we forget, TPG's make generally make their decisions in a matter of seconds (the sheer volume of material submitted demands this...), whereas we as the collector can spend hours or days debating the accuracy of the assigned grade..
I am NOT defending them, just playing devils advocate...... will mistakes be made, of course they will. Will the collector disagree, quite often...
However, in the big picture they are generally correct in their assessment concerning striking and wear.....
I have die adjustment strikes that look worn but are correctly designated as die adjustment strikes with an appropriate grade assigned.
Attributions of varieties are another matter completely. .... and I am not referring to that aspect as it has nothing to do with an assigned grade....