It isn't sarcasm at all. It is just the way it is.

In order to explain the lack of sarcasm more effectivelty, edited to add:
I agree that it absolutely would be better if therapists were perfectly matched to suit the style of each client, in much the same way that there would be little need for therapy if all parents were perfectly responsive to the unique needs of each of their children. But the world isn't that way, and it simply isn't helpful for anyone to say that therapists *should* do this or therapists *should* do that. Yes , it really would be great if that were the case! But coulding and shoulding is utterly ineffective in changing what is. The only thing that can change the outcome in a therapy situation where the therapist is notting and can'ting is to work within the boundaries of 'what is', or keep searching for a therapist who is better suited to our own individual needs (which, sadly, it is a trial and error process) until they find a therapist who CAN and DOES.

Because, as I have said before, not all can and will, and there is nothing that can make those who don't change.