What you are doing isnto compensate for the shift from gamma 1.96->sRGB - sorta with the added thing of comparing your broadcast monitor thats gamma 2.4 in the same environment to your gui display, so now its all over the place.
But yea so they are no standards for any of this so if it makes your clients happy- sure why not The increase in saturation by 20% sounds a bit much to me however.
Also consider non colormanaged Operating systems like windows or iOS that dont have the 1.96->sRGB shift… just because it looks like X on your mac doesnt mean it looks like that on someone elses macbook (other set colorprofiles… different environment etc)
I am personally also sticking with untagged or 1-1-1 for the same reasons you said, it does not survive reencoding or web uploading, but I am only doing a slight gamma adjust from 2.4->2.2 on export. This is the middle ground for me between all the options.
I then do a webmaster in gamma 2.2 with the web sound and TV master in gamma 2.4 with R128 sound , for the agency person on a macbook in QT the TV master will look brighter and its easy to explain that macbooks are brighter hence the web master needs to be darker than the TV master (very simplified).
I also burn in that transform as a LUT onto my livestream and then tell people to use safari so the exported quicktime matches the livestream and that matches the reencode and web upload/playback internally on a given device .
- will a mac match my broadcast monitor if held next to it?
-No.
-will it match on my gui screen .
-No.
Am i only trusting my reference monitor and disregard all other screens.
-Yes.
The main question is though - what do we want to display on someones device thats in some uncontrolled environment?
Old wisdom said the same exact pixels and the difference in gamma of the screens will take care of it but on MacOS - even if tagged correctly - it will not do that but is going for a different approach that is absolute luminance preserving - same as your approach - trying to match display X rendering to mastering display rendering as good as possible - flame also does this in its viewport - which makes sense if you have the screens next to each other (but then just maybe calibrate both to rec709/ BT.1886.)
Also consider that a macbook on full tilt brightness is like 500NIT while your reference screen is 100NIT… this change is way more significant than any minor gamma shift.
how I reached this conclusion is laid out nicely in this video, we did a buunch of research and there is no perfect solution but if you want to match some macbook in a office environment to a broadcast screen in a dark room you are going to have a really bad time…
There is no replacement for
looking at a reference screen in a reference environment when doing color decisions.