You nit-pick part of answers out of context, add words no one said, and I am just confused what are you trying to say then really.
Then you also write it in such weird condescending way that is meant to convey authority over the topic?
Input/Output wouldn't be what denotes the operator, the operation mode would. Even LUT in Corona uses hack to output partial HDR data (by extending highlights, trick that Ondra copied from VFB+ plugin after many requests, as it was very handy feature).
We don't have any ACES system, we have ACES Tonemapper, one element taken out due to popular request, operating in HDR space, not LOG. So what do you mean by no need for HDR tools? We're not talking about any movie pipeline, we're talking Corona Framebuffer.
Also framebuffer in Corona/Vray isn't a color grading operation only, it's also compositor and since it was built based on user requests, now offers hybrid approach that slowly encroaches towards "PhotoshopLite". So Tonemapper isn't last in order by any requirement.