I've thought about this and I tend to agree that it's an added complication we don't really need. But, if the time differences between different wheelsets is minimal, I guess it's not really that much different to the current situation of different frames and wheelsets giving a slight advantage on different terrain (eg lightweight wheels are slightly faster up mountains) which we're used to and have accepted. If you change the spec of your bike for one that's best suited to climbing the Alpe it's not really any different changing your spec for best performance on gravel. https://zwiftinsider.com/ is on the case and just like he's done loads of tests to confirm the fastest setups for flat/hills etc I'm sure he'll provide data on the best equipment options for routes with gravel sections once Zwift release wheelsets optimised for gravel - which I assume is their plan eventually.same here. I get they want to keep things interesting but this bit I’ve quoted below seems excessive to me.
“• Soon, dirt performance will be a factor in wheel choice. Currently, all road tires perform the same in dirt, and only the mountain bike (with its MTB tires) performs differently. This will change when Zwift begins releasing more wheelsets, and they may even change the Crr values of some existing wheelsets.”
It’s very gimmicky to me. They could at least let you choose tyres separately from wheels if they want to go down this route.
The one thing I would like to see - which may exist but I can't find it - is a comprehensive summary which routes have gravel sections, how long they are and exactly where they are, because this would be vital for making an informed decision on setup. It's easy to see the profile of a course to decide on whether to go for a climbing or pure speed setup, so knowing where the gravel is will soon also be essential I think!