While this is true, what they said isn’t wrong either. Completely depends on the content. This is why people like @Linea build extremely tough scrappers for upper tier content. Especially if you cycle specific defensive powers. You just need to find the break point of DPS per min for the content you want, hit that and build tanky from there. Doing any DPS higher than that is a diminishing return.
That being said, this is mostly for solo content. Doing 4*/Aeon stuff with a group? Just go all in on damage since your team should be cycling barriers anyways.