I do recall something of the such. I had proposed that Bulbless is more optimal for low wind sailing and that Bulbed was potentially more optimal for the windy stuff. This was around the time that LR did their windy video (just pre-xmas?????) and people were screaming at how fast and controlled they looked, but I suggested that each team was testing a certain mode - LR chasing an oracle like top end mode, AM a stable (but ultimately slower) mode and ETNZ an early take off mode - but trying to take it uprange by trimming out and sailing nose down with minimal immersion - and when you consider that the Cup races are scheduled for end of summer when likelihood suggests lower and more moderate breeze strength you would still want a foot in both camps. (NZ does not exactly have long periods of stable weather patterns)I just spent over 2 hours trying to find our discussion on foils where NZ was the outlier and all the other teams went with the bulb. It must have been in the "old NZ" thread that was deleted. I said that I thought NZ would eventually change over to the bulb foils. The idea was that all of the other teams had already tested the bulb-less foils on their test boats and all of them decided independently to change to the bulb foils. And all of the bulbs had the anhedral foils where as NZ started with one T-foils just like AM did on the Mule. Most of the NZ posters said that I was missing the brilliant design of the NZ foils, I said that NZ was playing catch-up because they didn't have the "on the water" test boat experience of the other teams.
Two sets of foil arms - one set for B1 and one set for B2 allows development of both styles and interchangability (they are a supplied and OD element) - Bulbless on one set and Bulbed on the other. You would not want to give up early takeoff for the sake of higher top end in light air sailing. Remember that vMax is typically 3.0 x take off, and is still limited to around 47 knots before cavitation enforces the "glass ceiling".
Besides look at what happened in Bermuda........ and where each team positioned themselves.
Whichever comes to be the case, you can be certain that the other teams are very closely following anything that ETNZ does. They remain the standard by which others aspire to.