1 - As I said - just a pet peeve. I'm probably being un-necessarily pedantic.
2 - Not going to get into the argument about a device being analogue because it uses something within its processes as "an analogue" (noun) of something else.
Because - frankly - the digital representation of that something else in a digital system is also "an analogue" (noun) of that something else. This is not how we've come to differentiate between analogue processing and digital processing.
EDIT: Aso analogue systems have a continuous variable as their "analogue" However, a mechanical clock's gears and hands has discrete position steps which only change with each swing of the pendulum or balance wheel.
3 - See other pointless debates along the lines of a system including within it binary states (On/off, in/out, black/white, high/low) etc also not being digital, unless those binary states are combined in order to represent numeric data. In other words, binary alone doesn't mean digital. Binary numbers might.
(Hence class D is not digital)
4 - Refer to 1. I reserve my right not to get into further pointless/pedantic debate simultaneously with reserving my right to retain my pet peeve, however unreasonable.
EDIT : I also reserve the right to continue the pointless debate by making ongoing pointless edits to this pointless post.