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I slightly disagree because I think it matters what training they have had. For example, not all Ts can deal with eating disorders or trauma. Even if they SAY they can.
I once had a LCSW who worked in a hospital setting for years and then went into private practice. Hospital setting is very different from private practice and I needed more than "building skills" and getting me functional... which tends to be the focus of hospital programs.

The relationship is important, but if the T has not been trained to deal with eating disordered clients, for example, the T could do more harm. Alot more harm.

Trust me... I have been through this with a T that mis-represented who she was and what she was trained in...... and the "relationship" seemed good for months.
Then when the "symptoms" of my condition appeared in therapy, she terminated... explaining that basically she was not "trained" enough. (and told other providers this)