And the fact that Samasung, is working VERY hard to replace all the Google apps with their own versions.
calendar, googleNow, and mail ALL are either off or not installed by default on the S4
and plain mail being the defaults
It will be interesting to see what Samsung does on the S5 (openmaps maybe?)
Samsung WILL either switch to Tizen OR fork Android in the next couple years, its coming...
Personally, I hate the Samsung apps, I'll never buy another unless I can get a version without touchwiz(horrible) and Samsung's crapware