Wasn't it you saying in lens IS was no longer necessary due to IBIS?
No, not exactly. With current tech I consider IS still a good thing for *tele lenses* ... plus IBIS in addition for something like an extra 1 or 2 stops of stabilization.
For shorter focal lengths lenses - eg a 50mm f/1.2 - I'd be willing to take without IS if body has a good IBIS.
Overall I am always in favor of avoiding duplicated items/cost with each and every lens, when it can also be done once per camera body. Even more so, when moving mechanical shenanigans are involved.
So ideally: solid state camera body, with the following functions "really right" integrated:
* Conversion of incoming photons into electrons and their subsequent processing and storage [sensor, CPUs, imaging pipeline, memory cards, software ]
* Blocking/Unblocking of incoming photons [aka "shutter"]
* Variable size round opening for incoming photons [ aka "aperture/iris"]
* Effective, automatic bundling of incoming photons precisely on sensor plane [aka "AF system"]
* Effective, automatic stabilization of image on sensor and in viewfinder/display [aka "IBIS"]
* Control points for those items [aka rings, dials, wheels, knobs, buttons, sliders, touchscreens, menu system etc.] ideally combined with status information displays. For example, instead of a "dumb top display" I'd prefer a fully customizable, combined control/information element. On camera body, instead of adding yet another "control ring" to each single lens!
For example something like this ...
https://photorumors.com/2012/03/23/interesting-mirrorless-camera-concept/
But it will probably be many more years until "innovative Canon" finally "invents" and drop feeds those "innovations" to us customers..