> Being competent at a thing takes a long time
> You cannot study many things at once
> Being a full-stack engineer will therefore take years
> Burnout is something that results from poor planning, poor expectations and poor positive feedback
> If you try to do something you can't, you may be burned out
They then go from there to concluding that this means that it is somehow likely you will develop burnout from trying to become a full-stack engineer. This is incredibly infantilising and damaging - people can be taught to learn constructively over a long time. They can learn how to do a great many things and they can store a lot of information.
If studying leads to burnout because it's not done within a year, that is a mental model that assumes everyone is functionally dysfunctional mentally. We call this a disorder. Patently ridiculous as a conclusion, IMO.