This is why I still haven't bought the Mavic Pro 4, even though DJI in Australia offered me a discount, we need answers on an All-I workflow from somebody, but as DJI effectively caused the problem it's up to them to lead the solution.
DJI really blew it with All-I simply (I assume) to avoid paying the ProRes license. We'll see if they fix this with a firmware update but as it stands there are very few people with Macs that would be willing to take the time to convert the All-I files into something workable.