That is already the case. On our last project, they refused to give us a ProRes becuase the files are too big, and they make one H264 for all parties concerned.
And we have to deliver our all premixes, intermediate stuff, also on a H264 video, so they can look/listen at it anywhere without having to deal with “adding audio to the video”.
We loose time, money and who´s responsibility it is if something is wrong after conversions etc…
There are no shortcuts, easy paths and faster procedures in post Production.
The problem just get shifted/moved/shoved in to someone else.
And since sh** floats downhill …
(There even was a time when sh** rolled downhill, but that is also a long time ago …)