UaMV They didn't so much distinguish between having to hit reply on the specific post or hit the highlighted reply button.
Honestly, that's the intuitive part to me. If you want a blank reply, use the main button. Want to reply to a specific post? Use the post-specific reply.
More often than not, I want a blank reply, but my mouse is closer to the post-specific reply. So I just remove the mention and carry on. ?