So, I just want to make this clear. When we say observers, we are also referring to dead team mates correct? Not just observers who joined the game as observers?
If that's the case, where dead players can apparently switch army views and get info they shouldn't, then yea that's not such a great exploit to have around. On the other hand, if it's just actual observers, not dead players, then I don't think the fix is worth it. Most lobbies have observers off anyway.
Even if it is dead players, I'm not sure it's worth it either. I've never heard of this exploit being used, but obviously that's just anecdotal from several hundred games, not several thousand like some people. I personally like my dead teammates being able to ping (unless you're a certain annoying someone, I won't name names >_>). I find it much more helpful than talking in chat which is easily missed. I mean, pings exist over chat for a reason right?
So IMO the fix isn't worth the loss of functionality given to dead teammates, unless the dev team has info we do not that the exploit is actively being abused. If it is, I'd understand the fix.