I've always asked this question when I've been interviewing therapists, and when I was looking for someone a decade ago, I interviewed about a dozen. I'm sure at least one said something uninspiring about just having to sit there for a living, and I didn't choose that one. My T said that he returned to school in his early 30's to get his MSW (after many unspecified vaguely professional jobs) because he'd entered therapy and found it helpful to him. Later I understood some of his difficulties growing up in a not-too-detailed way.

I think it's a perfectly fine question to ask your therapist.