Dying is very important in games like battlefield, they have different ways it affects the game, from each death adding cumalitive time to the respawn, or having each death take away from the 'reinforcements' and many other perks/cons to killing or dying.
Also, battlefield types takes place in much larger maps, with things like combat vehicles and personell transports people should load up into and drop down over capture points with, with much more organic, and much less focused design, and lacks the color coating aspect which is a massive visual tell when looking at the map, you cant gather every single peice of info needed to know exactly what you needed to do at that moment in the game by glancing at a map, even if every single enemy and their orientation was on that map.
They are very different.
Of course including voice chat would not destroy the games design. Just because it is perfectly functional without it doesnt mean it would not be nice to shoot the shit while playing, and laugh about things that happened.
The same way not having it doesnt destroy the games design. It would have been nice, but this shit storm is ridiculously out of proportion.