I don't have a video of me, but one of our hunters who plays within the old "normal" viewing distance (so closer than is possible than in Legion
made one on Mannoroth. You can see the whole area where the fight is going on all the time. Also on Archimonde, you can easily see 80% of the platform in phase 3 even when you are in melee range if you just adjust the angle right. No problems there. And I would question as to why you need to see the platforms all the time - it is no necessary or useful.
I don't get your problem with setting up markers.
How many do you even place "infight"? There is not a single fight I can think of where max view distacne is needed to place some freaking markers.
And even if: you are unable to adjust your camera a bit if needed? Seriously? Then you have other problems that are not the cameras fault. There are multiple fights where the room doesn't allow you to zoom out a lot. What do you do there? Lay down and cry? Stop raidleading?