The whole 'nuetral' thing is something Ive heard thrown about mostly to do with ezzy sails ( I dont ride Ezzy ) , but having listened to it for years - and after jumping on some other brands 'power' wavesails and membranes - Ive realised its a bit anti brand BS .... For example - Ive found there's sails that go toooo neutral off the top (think very soft sails etc ) - I used them for some years .... great for cranking a turn - but that nuetrality can also suddenly make them feel heavy when the lack of battens are not providing glide and drive into your next turn /ie pre shape suddenly disappears and you feel the whole (non aerated / non inflated) arc of the sail weighing down - especially if theyre not built light .. - so its all horses for courses imo
I guess the reason Ezzy use the language (neutral) is because in my experience (I've had the Taka 2,3,4 and now the 2020 version), it is an accurate description of how the sail feels in transitions and in turns on the wave in DTL conditions - and they are very different to the "soft" sails you describe experiencing in the past that
"feel heavy when the lack of battens are not providing glide and drive into your next turn /ie pre shape suddenly disappears and you feel the whole (non aerated / non inflated) arc of the sail weighing down.....". It's quite the opposite, I find that the Taka never feels heavy in the hands and it is extremely responsive between being neutral and having power on tap, which is what makes them so different - providing power, glide and drive into your next turn after have that awesome free feeling of it being in that neutral state.
But I do agree, they are not for everyone (horses for courses), as with everything windsurfing it's all personal preference as to what you like the feel of and get on well with. Like I said before, not better or worse, just different.
If you sail cross off DTL conditions then I highly recommend giving the latest version of the Taka a go if you get the opportunity, to truly understand what they are talking about.... then feel free to call it a myth, or BS if that is your experience