sachiman I thought it was basically pushing it back to srgb as view-transform,
The srgb view transform is applied with all of the views under the sRGB display, except or Raw or None or whatever. The difference between the views is in the look or tone map. Un-tonemapped will give you a straight sRGB view transform without any looks or tonemapping. This should match sRGB input textures on output to display. The view called "ACES 1.0 SDR-Video" is the ACES standard tone map for video. It compresses the dynamic range but also shifts the gray point down a little more than a stop. If color matching is required for some constant color images or a plate or something, the inverse display-view transform can be used instead of a colorspace transform (although maybe not with the confines of a shader).