As you know I don't ride IRL much, and even when I do I rarely ride in groups ... but when I did the Dorset sportive last year the group I was with did say to warn others behind in group if they were about to stand up on a climb as the bike can 'shoot' back temporarily. i'd assumed this was because, as you stand you stop pedaling for a fraction, lose power, and slow down. Does this make sense? If it does, is this what Zwift is simulating? Or is it all just bolloxI agree with all of this.
Re the NEO i only recently noticed this and assumed it was a post operation consequence of withered right quad. Dan Lloyd, who is doing the Sufferfest 10 wk training plan also commented on this using,i think,a Kickr and put it down to loss of power through lack of riding. Perhaps it is a NEO/wheel off turbo quirk.