I find some of the commenter's responses to your post who seem to be really excited about the downhill drive to be rather curious. The majority of my trainer time these days is in Zwift rather than TR or outright wattage/interval based workouts and I still find that to entirely be a non-issue on the Kickr.

Back when I had my CT and was trying to do the virtual IM courses it was a different story, I remember doing the IMWI RCV and found it to be awful since there are a lot of rollers that increased the resistance, but the numerous downhills were still like riding through tar.

With Zwift and the KICKR I suspect it's a combination of both better software and simply having a flywheel with much more inertia, but I'm pretty sure that I coast down the entirety of Watopia's descents as it is and the spinning out at speed feels relatively accurate. Of course if I were simulating a prolonged descent you would run out of coast time, but simulating a long 5-10 minute descent on a trainer sounds like a fabulous waste of time to me and I'm not sure how having a motor drive would in any way change that.

Without a flywheel it makes sense that they'd have a more active mechanism to conserve momentum over simulated negative grades, but it certainly is the feature I am least excited about on the Neo.