It's an interesting discussion, that's for sure.
Here's my two penneth:
For one, I think that yes, the reality of professional dancing will come as a shock to some of those not uses to it. It's brutal, in both the physical sense, and how you will be pushed mentally. Those who are used to it, are perhaps steeped and entrenched in some of the harsh elements of this competitive lifestyle, and therefore become immune. Those that can't cut it, then not to get to the top. It is harsh, but that is the reality. I've been both a dancer and a chef. Both worlds tend to be the last bastions whereby being spoken to in a way you wouldn't expect (shouted at and swore at) are still deemed permissable. It's not for everyone, and nobody should put up with anything that makes them feel like shit. I've seen folk who've been shocked and rightly walked away.
The show (and the profession) has meant that it does / can invite infidelity. It absolutely is an element that the press love, and it's been sad ro see over the years. Sadder still, that it is affectionately termed as The Strictly Curse. Again, the reality is that there are some professions where this happens more than others. The police service, for example. The difference with Strictly is that it is all public.
In relation to language (Trauma, PTSD, etc) it's sad that people are dismissed as putting it on or over exaggerating. Only those people involved know how much it has affected them. Maybe it has brought to the surface some other trauma that they haven't dealt with. Trauma takes on average around two years for a person to even recognise.
It's true that PTSD used to be almost exclusively associated with war. It is also (rightly) now recognised that other traumatic events can and do cause PTSD. As others have said, it's not a competition, nor a race to the bottom. It is only right to note, however, that there are levels of severity. This also comes with its own complications when we are seemingly all seeing Trauma and PTSD referred to more regularly in everyday life.
Language and terminology changes all of the time. It has definitely become more acceptable to discuss mental health. This is a good thing in many ways, but is also fraught with complications and is always going to be at the mercy of a selection of people who abuse those terms.
My Grandad was in WW2. After he returned from the war, there was a competitive element about those who spoke about their trauma and those that didn't. The ones who discussed it in any detail were often deemed to not really have been affected, as "If you'd seen what I've seen, you couldn't possibly even talk about it" That was toxic masculinity at its height as far as I'm concerned.
Both ends of the scale can be toxic and dangerous (those who never speak about mental health, versus those who seemingly abuse the terminology)
I always try and think twice before I comment on an individuals situation, as I'm not in their shoes. I categorically cannot know what they personally have experienced. In particular, it brings to mind survivors of rape and sexual abuse who haven't been believed, and I always find that heartbreaking.
Some people will use more emotive language than others. It does muddy the waters when that is not genuine. In the main, though, I think I'd rather give people the benefit of the doubt, unless proven otherwise.