Yes! That’s the point of the metaphor! The SSRI is the rock. We’re not exactly sure how it’s gonna land, or what it’s total effects are on the machine, but it’s the tool we have and it’s the one we’re using. I don’t remember where I heard it, but I instantly understood why I became so paranoid all those years ago when I tried antidepressants.
edit: and that doesn’t mean that a person shouldn’t try using them. They can be incredibly effective. But they are what they are. Not a quick fix, and (to most people) not a long term solution.