I agree that they are good at modelling forgiveness, tolerance and boundaries but also flexibility and initiative- simply because they have to use their initiative and be flexible with the way they use it for each client.
Each client is unique and if therapist is a one trick pony and only practises one type pf therapy the client will go else where, so in their line of work they have to be very flexible to meet each clients needs.
Also just because a client is depressed doesn't mean they are going to be like the text book client they learned about in t school they will have to use their initiative to figure out what the client needs and how to work with them best.