"Talking about it" and "talking with a therapist" are different, and a good therapist using an evidence-based approach to therapy is effective. Evidence-based therapies are different than "chatting with a buddy."
That said, finding a good and well-trained therapist is often difficult. In approximately 10% of people, psychotherapy makes things worse rather than better. Sleep hygiene and regular exercise are always a good idea, and in some cases medication is worth considering.
Do you have any experimental evidence for that?
The alternative is that they put on a mask to function in society, because they don't want to be a burden, all the while dying inside...
Until they unexpectedly disappear, because they've committed suicide.
As regarding "making things worse"... well, sometimes it might. For example, say over the years you've developed strategies for coping with depression that involve angry outbursts. Getting into therapy to help with the angry outbursts may "reveal" the underlying depression for which those coping strategies were developed.
Therapy isn't a production line. Everyone is different. You are paying a mental health professional to get to know you as well as you feel comfortable with, and collaborate with you on treatment for what you're there for.
I think it's the same for depression. It's nice to not have to live in hidden shame where you know that something is wrong but nobody accepts it as real.
It’s irritating and off-putting.