I can’t give a reason for why it was changed, but I can tell you why I like the change.
Z0 is typically on the surface of your stock. A single move to X0Y0Z0 could potentially have the endmill moving at an unsafe height (clamps). There are also times where one would want to set Z0 at the bottom of the stock or at some depth into the stock. This would obviously be an issue, possibly a safety issue, if someone hit that button by mistake.
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