I wonder how widespread the extra zoom limit use actually was. I get thats its never fun to loose a feature you used to use but I cant actually see this having a significant impact. If you cant get good angles to see what you want anymore you simply have a ranged calling out things that a melee would have before. I certainly survived much 40 man raiding and some 25/10 people raiding without ever even knowing you could zoom out further.
I raided decently high end for years, top 100 worldish been a long time since being competitive, and quit raiding around the middle of WoD and you are the first person that I have seen stating they didn't use it. Back from vanilla through WotLK when I was GM it was one of the semi required things for our raiders. Around MoP we stopped asking about it as we just assumed anyone interested in some form of decent progression was already using it.
As a healer, tank, or a raid leader it is basically required to perform optimally. With the default setting healers cannot see everyone within their healing range, 40 yards for the most part. Tanks for the most part could not see past, around, or over the boss' crotch. And there's really no way I could have effectively raid lead without being able to see the whole raid, where people are positioned, what's coming next, such and so forth.
It's also not about always having the camera zoomed completely out either. Questing is more enjoyable zoomed in closer and sometimes to see an objective you needed to zoom in. 5 mans didn't "need" the camera distance either. There are many times in arena when you wanted to be closer to the action as well. It was having the ability to take an option, a tool, and use it to the best of its ability in the appropriate situation that Blizzard has now taken away from us.
The only way I can see this working is if Blizzard drastically shrinks the size of boss' and adds or dumbs down fight mechanics to compensate for the lack of awareness of our surroundings. The other option would be to assign several raid leader type positions for specific areas of the combat zones and frankly I cannot see that working out well. People capable of raid leading adequately, let alone willing to do the job, are already in short supply. Now throw in having to have 3 or 4 people to call things out and voice coms are going to be flooded.
Granted, I don't think this affects a massive number of people. The majority of people who just log in to do their dailies, 5 mans, and LFR will feel nothing from this and probably didn't even think about it before now. Now if you're a guild who does raid say 2 days a week and sit somewhere around spot 25 or lower on your server (decent pop) and who basically progresses past content after overgearing it through farming this might actually have some effect on you. There's bound to be a couple stronger players who help push you over the top and their ability to max out their play will be somewhat limited.
What I think is that this hurts the "progression+" group and up to the top guilds the most. What I mean by "progression+" is the group that tries to finish content while still current. The raid group that gets most of the mythic bosses down before the next raid is released. And I think that hurts the game as a whole. When I first started playing I would be leveling my war and come back to Iron Forge (remember this was the hang out spot in vanilla for Alliance) and see the raiders in their raid gear and I wanted that badly. So I earned that. It was that carrot on a stick that made me want to play more and more. Playing more fostered friendships and a social environment that I wanted to remain a part of, friendships that I still have to this day. That is what I think WoW is missing these days and why people look back on vanilla and BC with rose colored glasses. Yes, the game is a fundamentally, foundationally better game today then back then but it lost that carrot around the end of WotLK and the social aspect somewhere in Mop. At least for me it did.
I was really looking forward to Legion. My children are old enough that the wife and I have time to raid again and FF14 just doesn't really cater to raiding. It is much more a jack of all trades MMO that does a myriad of things rather well but not raiding. This change by Blizzard hurts my desire to raid again.