I think this guy
here and
there elaborates what I was saying pretty well. Feel free to provide reasons why he has an "insane" take as well.
'this guy' is Bret Devereaux, a historian who focuses on ancient Mediterranean economies and militaries.
He has very good education in the Ancient history field, and definitely knows more than me...
but historians disagree all the time, and quite a few disagree with his take on WW1. Funnily enough, he actually falls perfectly into the 'Cult of the offensive' ideology of the commanders at the time, who agreed that hitting fast and hard was the valid strategy of the time.
History proved them wrong quite clearly though.
Although it is true that there are situations where the casualty ratios favored the attacker. The reasons for that are entirely unlinked with idea of the best strategy being to attack constantly, for example, it is common knowledge that 75% of all battlefield casualties were from artillery. Quite simply; best artillery won.
One of the most quoted 'attacker bias' battles, Verdun, the death difference between the two armies was around 12-18%. And the Germans had higher casualties for most of the battle until the end, when they took advantage of the French retreat.