This is why the OP calls pop-Stoicism vacuous. It isn't really helpful to know you should always take the best action, or not waste energy on things you can't control. The challenge is knowing what the best action is, or what is or isn't in your control.
What do you mean by OP?
The comment I responded to didn't refer to pop stoicism or use the word vacuous. The word vacuous also didn't appear in the article.
Stoicism is the study and reflection of what is and isn't in our control and what are virtues. It doesn't just stop at declaring the goal, it's literally the practice of pursuing the goal.
Both you and the comment I replied to seem like opinions based on a very shallow understanding of stoicism.