I suspect calling V1 prior to V1 is about getting ahead of the call out, given all the evidence of bad decision making on the roll.
With the preponderance of flex, putting all the runway behind you folks, it's become more critical to get the RTO performed at exactly the right time, as you have taken away all safety margin ahead of you.
Wouldn't a max take off, with miles of runway ahead of you preclude the need for such 'tweaking' of the call outs?