[Nick]
> - deprecate aware time() entirely (raises the thorny question of what to return from .time() on an aware datetime() object)

aware_datetime_object.time() already returns a naive time object.  The thorny question is what .timetz() should return - but if aware time objects _were_ deprecated, .timetz() itself would presumably be deprecated too.

> ... you can't easily attach a date to the time to calculate a time delta.

The class constructor datetime.combine(date_object, time_object) makes it easy to combine any two date and time objects into a datetime object.