No, the point is that not everyone is cut out to be an engineer. If you find yourself being depressed as an engineer, one possibility is that it's really not the job for you. Not everyone is capable of being an engineer, and being prone to emotional disregulation is probably a good indicator. Not to say you can't muddle through, but the original post was saying that you should at least ask yourself if you'd be happier elsewhere.
This is ableism.
Yeah, you articulated it better than me. Especially in the case where the OP is indicating that a lot of their stress comes from inability to perform or get better in an engineering context. If after a few years you aren't feeling more confident in your skills or aren't more comfortable with your tech stack it's time to re-evaluate. OP mentions they prioritize stability and I think a lot of people get into engineering for the wrong reasons.
In my opinion the prerequisites are a natural aptitude and a genuine curiosity.