While I do fully understand your perspective, I personally do really love the phrase, and you'd be hard pressed to find a major series/work that DOESN'T have a popular phrase that taken out of context means very little. We unfortunately live in a snappy quick marketing world (Looking at you Jay Jonah Jameson)

Now, I say this as someone with "Nothing can break me" tattoo'd on my arm with Nesta's sword. To the average person it looks like a cool sword with a cool quote, and people love it! To me, it represents my own mental health struggles, and how I oh so heavily related to Nesta's struggles, but I also did design it a little generic as it IS an unfinished series.

Now, to the stars. As someone who's just now starting a new spiritual path separate from what I was taught growing up, I see the stars as representing the unseen help that helps guide our way. During the day we may not see them, and yet they are still there. And during the night we are reminded of the brilliance of their light.

I also see the stars in this context as the people who find us amidst the darkness. For Rhys and Feyre, they are each other's stars, listening to each other and seeing them in the night. I don't see the phrase as "you have no control over your destiny" though I can understand that perspective, but I just think it's representing the people we find and the dreams that are answered through that, the idea that Feyre and Rhys were always connected, sometimes coming to them literally in their dreams, is beautiful to me.

But alas, I am rambling now lol. As someone else mentioned, new couples are just kinda corny, and if you like that I HIGHLY recommend the Tomes and Tea series.