i think everyone is still using the filters. However, it should be noted that when doing closeups with lots of artificial white light (assuming a dive light), you need to take the filter off. Although, it actually looks rather pretty over saturated with red. lol.
I just got back from la paz. Great clarity, great people. Probably my favorite Mexican town to date. Not a huge variety of fish, but very pleasant.
Most of the upgrades in these cameras has focused on providing 4k and image stabilization. White-balance still sucks in my opinion because of the low dynamic range of these cameras. I'm kinda talking out my arse, but you definitely get very weird artifacts when you transition your shot from dark coral to white sand. Looks like garbage even on the 6. Haven't actually tried the seven, so maybe you're in for a pleasant surprise? Super good deal at $399 though.