One case this is designed to ease is initializing multiple I2C devices on the same bus, which is common when using multiple feather wings. With a singleton in board the device drivers can default to the same bus:

d1 = device1.Device1()
d2 = device2.Device2()

With the proposed default args we'd need:

bus = busio.I2C()
d1 = device1.Device1(bus)
d2 = device2.Device2(bus)

The second option does make it easier to change the pins but how common will this be? With featherwings in particular, this is highly unlikely. Are we ok with the extra step of the second option? Is the first too magical?

I think it'd be tricky to have a shared default bus like the first option without having it built into a core module such as board or busio. If we put it in adafruit_bus_device we prevent mixing bus device drivers and non-bus device drivers.

Add default buses to board #372

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