I'll give the new gestures one credit:
When driving and using navigation mounted on a car dock, it's easier to switch between two apps (the alt tab feature) with a gesture. Easier than double tapping for the alt tab. Easier = safer.
The quick swipe right works great in general. So it begs the question, why can't swipe left work for a back gesture? It's a waste to not put this gesture to use.
Then for home and app switcher, copy Apple. I'm serious. Swipe up for home -- always available. Swipe up and hold for a split second (maybe make this a hair faster than Apple's) to go into the new app switcher screen -- and here, keep the same useful features from this new screen, like your main dock of icons being available.
And that's it. Boom. You have the right gestures for the best mobile OS navigation. Because Android's navigation is better than iOS'. It's always been, with its consistent back button and fast alt-tab.
You could even have a "long swipe up" to pull up the app drawer from any screen if you so wish, so long as a short swipe up will always take you home.
And lastly, for Google Assistant, same long press of the home bar (the new visual cue similar to iOS').
Done.
I agree. And this is the kind of thing I always try to make happen when I'm using P, instictively and it's jarring when it doesn't happen. It's almost like re-learnjng a whole new OS (well, maybe not that extreme) but it's not far from it if you're only used to pressing the three capacitive buttons.
I like that the new features are optional, but wonder how long that'll be the case for on Pixels.