Yes I would like some clarification as well. I’ve spent hours chasing my tail on this issue, and it seems to have been fundamentally broken for many years (when searching for answers) without any kind of input from the Unity team.
The workaround listed at bottom of the page here by DavidDreamer was very helpful.
That works well enough to work around the bug and adjust intensity via code, but I cannot get it to then also work with an animation clip. Driving me completely insane.
Emission_Intensity seems to be absolutely and fundamentally broken, and I’d really like to see someone say they are working on fixing it.