My take on it is based on a few things:
<input>element, linked in my second post above, supports this idea)
I’d love to see an unchecked-by-default radio field in ACF, as I’ve had a few scenarios where it would have been the perfect solution.
Given the perception that one member of a radio group is always selected (expressed by a number of people on this issue), maybe it would be more immediately obvious for admins if there was an “allow null” option.
That said, because the current interface already allows a default item to be set, my feeling is that it would be more intuitive for no option to be pre-selected unless it is specified in the Default Value area.
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