That is the point of "good enough mother" - of course the mother (and therapist) will let us down at some point, in some way (even if only in a small way). They are human and imperfect. The important thing is that they are good enough to provide us with the necessary care to help us grow and develop. That also leaves room for them to be flawed enough that the child (in the case of therapy, client) gets used to the reality that to err is human and life is imperfect, that sometimes mom (or therapist) is available and sometimes she isn't, but that that's okay because she's there enough.

In the case of my therapist - yes, he is a good enough therapist for me. Thank you for reminding me.