The problem is that a version of this advice can be very helpful. As someone who has suffered from ongoing mental health issues and also work in an industry where I regularly support people with mental health issues, one piece of advice I often give is to identify what traumas are you unnecessarily holding on to, which are contributing to your depression/anxiety etc.
When you can let go of some of the more mundane stresses in your life, you have more energy to tackle the real issues you’re facing. Of course this is much easier said than done and has to be used as part of a more wholeistic approach, but sometimes the advice to just learn to let it go is very good advice.
Unfortunately, many people don’t understand that intricacy and so just repeat the surface level comment which is far from helpful. And this in turn also leads to a push back in the other direction where people who could genuinely benefit from letting go of some of their stress refuse to do so because they have spent so long being told that’s all there is to it.