meh.....it is pretty much out of the box. These apps aren't new to Android. Lock screen notifications have been around a while too with a number of apps. Yes, they are now baked into 5.x but they have been available for any stock android phone for a while.
That's the idea with Android, the system is very comprehensive but then you can add pretty much any feature you can think or change any of the stock ones to fit the way you wish to use the phone.
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doesn't matter if it's in the out of the box. any number of apps can be seamlessly added to do that for those interested in it. I use Popup as it's very comprehensive in how it works and what features those lock screen notifications will show.
Actually, it does. That's why Apple has been so viable for so long. Their devices are very tried and true, but tiring to techy people. I used to be really anti-apple, but I warmed myself to acknowledging their presence and positives. A lot of casual users just want function built in and have to rely on apps more. I know this as an Android user, but using 3rd party or G-Apps over S-Apps and Touchwiz disrupts the continuity of my phone. I like having a consistent UI in core functions. Android disrupts it, but that's just me w/ what I said with Touchwiz.