There is no one correct way to view boundaries. Everyone gets to decide their own.

For therapists, dual relationships - aka socializing outside of therapy - is very risky territory. Legally risky. Lose their profession risky. Well-proven to destroy therapeutic relationships risky.

That T doesn't even know you yet. Yes, therapists may maintain flexible boundaries, but they have to trust a given client enough to do so, as we have to trust our therapists. It's a two-way relationship, if one like no other. You're essentially asking a stranger to agree to risk her career for you in some hypothetical situation.

Why would you expect someone to do that?