Yes - I am sometimes the only passenger on the bus when I've used the H between RD&E and Middlemoor. But I do tend to travel against the peak flow.
I am quite surprised the frequency is being reduced to Countess Wear... I've usually found the buses to be busy enough, although can usually get a seat. Service cuts are usually dressed up as 'reliability improvements' - I've not had much of an issue with reliability on I/J/K/T personally.
I thought the D was funded by Devon CC for the Digby section but not completely sure on that.
I think the B, E, F and L are also being snipped a bit, whilst the P, R and S are already reduced. All minor cutbacks, but it all adds up to a less attractive network - particularly for turn-up-and-go usage.