That proposal is probably fine with me (with wording tweaks), but I don't think it's necessary. No WebGPU implementation that supports getConfiguration would be missing toneMapping since it's require by the spec. But, the implementation is allowed to ignore that the user specified extended ...
Thanks for the fast turnaround, I suppose this can be closed - I was confused by the wording on MDN, where the vocabulary for Image was unfamiliar coming from working with WebGL canvases. Note that the quoted text in the OP ismeantto be addressing the topic of high-resolution backing ca...