I just saw John Carmack mention this in his OC6 talk. I mean, come on, if there's a chance you can up this thing to 90Hz, even if it's only for desktop mode, then you really should make this happen. Yeah, it's a hassle and cost on your side, but not one customer is going to complain about you making their VR experience the best it can be, especially when from their end there's no hassle involved in getting that.
Yes, would love to see 90hz as an option, especially for Oculus Link. I completely understand if it's not enabled for native games to save battery life.
A 90hz mode could also be made available to devs to use on a case by case basis. Certain games like racket fury / 11 table tennis would heavily benefit from this.
While I understand the limitation on both the onboard SoC and the bandwith limit of USB-C, if there is some magic that increase the framerate without noticeably compromising visual quality, I'd love to see that. Framerate has always been more important to me than resolution.