You're saying that many people aren't following the standard correctly, and asking for opinions.
There are two things, here, about which I have an opinion.
Standards need to be followed. To me, a widespread failure to follow the standards reinforces the need for UX practitioners and UI designers to do a better job at following the published standards.
Professionals can argue the details this way and that, with everyone able to justify a different conclusion. THIS is why standards exist. The decision's been made for us, so we can all be consistent, with all the benefits to users that flow from consistency.
My opinion: follow the standard that Google set out, until they change it.
Animation flushes short-term memory, so avoid animation. The Materials guideline is new, and it's easy to see sexy details—like animation—and want to use them everywhere. But the problem with too much animation is that it triggers a looming-stimulus response. This is an involuntary response, much like startling. It takes place in response to an unexpected change in our visual field. In response, the brain does these things:
- release some adrenaline.
- dump anything in short-term memory.
- do a visual re-scan of the environment.
This looming-stimulus response, or defensive arousal, is great when something unexpectedly jumps out at you. What if it's a tiger or a bear? Having a brain that forgets whatever you were just doing (dump short-term memory), takes stock (visual re-scan), and prepares for action (release adrenaline—to run or fight) is definitely an advantage in the real world, where, if not tigers and bears, cars and people might bump into you.
Why has the looming-stimulus response evolved? To help us pay attention to things that move.
But having a brain responds to unexpected visual change in this way is much less useful when the trigger is merely some unexpected movement on your phone, in the form of an animation. Because releasing adrenaline increases stress. And dumping short-term memory leaves people wondering: "Wait, what was I doing?" That doesn't help people complete tasks on their devices, however beautifully animated to the Materials standard. Since a looming-stimulus response is involuntary, users cannot choose not to react.
As UX designers, we cannot expect users to overcome evolutionary advantage just because we've had a few years of phone animation in our hands. Triggering a looming-stimulus response likely isn't good design.
My opinion: use the animation sparingly. If Google allows you to choose a static UI or a less animated UI, favour that.