Moto's Active Display is far superior to the native Ambient Display. I miss being able to read full messages at the touch of the finger on the lock screen. I wish Google had taken this with them when the sold Motorola.
The other thing I miss is the Moto Driving feature that announces incoming calls and texts. Probably not needed for most people with BT cars, but a really nice feature if you don't have (or want to use) BT. There are third party apps that will announce & handle sms, but none that I've found that will handle incoming calls.
That said, I can't go back to my forever locked to Lollipop VZW 2ndGen Moto X, don't particularly like the new Pure's design (esp. compared to the 6P) and in any event refuse to patronize Motorola again after being screwed on updates. Pity, because I do like and miss the Moto software additions.
...Adding, IMO the fingerprint reader and fast, frequent updates directly from Google more than compensate for loss of the Moto features. Do wish I could have both.