I’m not on Zwift yet because I don’t have a suitable computer. New computer with Graphics Card is now on order purely to get onto Zwift, but I suspect I’m in a minority of people who will save up to buy a new computer just for this. So in my opinion, a retro-looking UI for people without graphics cards or lots of memory / CPU would be nice. I will be the only one of my friends with the necessary equipment when I have this.
Most cyclists are the perfect age to appreciate 2D Stick-Men on Stick-bikes for computer graphics :-). Something like this:
Everyone will prefer the proper graphics if their computer can manage it, but this sort of thing would make it more inclusive for those that want to ride with their mates but don’t have the technology.