I personally have no issues seeing minor emotional, interpersonal, discipline etc challenges as mental health issues. For me, it usually helps to define and categorize them. I think Ts often share these things with clients as an attempt to express empathy, to appear more relatable, or to make the client more comfortable. I think it's not a bad thing in a low dose and in appropriate context. When it is more a problem and acting out on their part, I think it usually comes with more than mere sharing, like manipulating the client, being irresponsible, unreliable etc. I also think it is not good if the T uses it as distraction or avoidance from doing their work. Like, normalize the client's feelings and problems, suggesting it's okay since they also have those things. So no reason to invest harder wok to resolve them or to help. This last bit was my main issue with my second therapist. Our sessions became full-blown back and forth conversations about whatever, instead of focusing on what I wanted to address primarily. Of course I went along with it but, as a professional, I think he should have seen through it better and should have helped to keep the focus and not dilute the therapy.