One of the advantages of having a Nexus/Play Edition Device.
They have almost all their users on the latest OS, they control the stack end to end and everyone is quite fine if features are only supported on certain models.
71.2% can be ignored since android wear doesn't support them. My own experience in wearable tech is that 68.7% of our android users are running 4.4 and the nexus 5 is twice as popular as the next most popular phone.
Not necessarily. Remember the huge problem with 2013 Nexus 7 having wifi and bluetooth on at same time? Many bluetooth keyboards and some other accessories just wouldn't work at all with wifi enabled. It was broken for the longest time. Looks like it still is not working properly for some users:
They have almost all their users on the latest OS, they control the stack end to end and everyone is quite fine if features are only supported on certain models.