Like I said somewhere else in this thread, all these new features are for Apple, not for users.
If they designed it for users, they would have NEVER made it so that they have to tap twice to take a photo before sending. Not to mention how they don't even allow you to open the camera as fullscreen.
Isn't it really ridiculous how nowadays when you want to take a quick picture and send it while messaging, you have to close the messages app, open the camera app, take the photo, and share it back to messages? Used to be: tap the camera button. Take the pic. Send.
But my point is exactly this. How many taps did it used to take to quickly take a pic and send? One.
Now with iOS10, you tap the camera button, swipe to the right, and then tap the "real" camera button one more time. That's 3 times the number of gestures it used to take pre-iOS10.
p.s.
How did you even discover that swipe feature? I'm pretty sure most people have no idea that's how it works. I am an iOS developer so I'm not exactly a laggard, either.
Now all you get is this tiny preview rectangle at the bottom. It doesn't launch a full camera so is useless for most cases. That's why I have to open the "real" camera app and take the picture and come back.
So now it's tap-swipe-tap instead of just tap, but in exchange the old functionality of sending an existing photo has changed from a long series of actions to just tap-tap-send.
There are now so many garbage features, tangential to the core purpose of the app — self-deleting audio blips if you move the phone this way, internet GIF search if you swipe that way, weird drawing pad, stupid variable-location popup to add "HA HA HA" animation, recently-played music grid, full-screen-or-sometimes-not fingerpainting applet, image editor, heartbeat monitor, fucking kiss simulator (what the fuck), and I know from sorry experience (usually when trying to send a message with one hand while carrying something heavy and awkward) that there's more shit buried in here that I can't even figure out how to navigate to right now, like a signature editor — that I have had to help my dad, my wife, and my kids figure out how to get back to where send a fucking message with it, repeatedly.
You could use iOS 10 Messages to create a 6-episode TV miniseries called Software Design Gone Horribly Fucking Wrong and surely win an Emmy award for best documentary.