The problem isn't identifying how the player was killed in game, the factor here is, who, what, where, which weapon, time frame / date, map, server, and etc. I've been killed by many players with a high K/D and never once complained about that, because some may have squad mates actually reviving them and doing their part. It's the other half you have to watch out for, for example, you say EA / DICE have been doing good, I can say 50 / 50 on this, because I have reported a ton of players and still I have observed a good handful still active, so yeah I am not a fan of EA anymore.
Yet the point here is I have had players use rocket launchers, sniper rifles, and a heavy machine gun and kill me from legit across the entire map of a starting point. The team with the hacker even video recorded this player and reported him, but to this date and time this player is still playing. Not hacking I would ask EA? How funny it is an entire server was bashing this player and observed him hacking and yet still on and gaming.
I do get there is most likely thousands of complaints rolling in and EA / DICE are trying to look into each one maybe, but I have not once lied about someone hacking. I have come across many solid good players who are just better than me over the years of playing EA Battlefield Titles, but needless to say, I personally do not see a higher skill cap on the many you say or think there are. I am not stating it's impossible to see better players, but to say it's less is total crock.