I disagree with this. It's not a meaningless platitude. I believe it is actively misleading and damaging.
You can lose valuable time/youth if you sit back and just wile away your time as you see fit, thinking that it is the nature of life that a man will appear out of the ether sooner or later and be drawn to you, exceptions withstanding.
When I was younger, I thought "maybe there's something in it". There isn't. Prince charming is not going to come knocking on your door.
As others have said above, exceptions withstanding, like EVERYTHING else in life, you have to put in the effort and go for it: studying, exams, getting a job, planning a trip, learning a skill, finding a good flat, making a life in a new place, developing a garden, making friends, building a network, EVERYTHING.
No one ever told me that, all things being equal, you have to go out and actively look for a partner: prep yourself, seek out opportunities, take every opportunity to socialise, etc. I more or less thought that love was supposed to find you organically, that you would walk around a corner and clap eyes on and be woed by your true-love-to-be. I now know that is not how it works, exceptions withstanding.
Example: later in life, I learnt of a friend of a friend who saw the CVs of incoming graduate trainee-types (with photos too, I imagine (1990s)). She ID'd the guy (maybe a couple of guys), she fancied and thought suitable and engineered the whole thing (meeting him, accidental encounters, shared interests, etc.). They married. (Obviously, he and she came to like and love each other, but she made it possible for it to happen for them, by striking up the friendship and getting things going between them, as she secretly already knew his interests/background and could tap into that). She obviously knew that it was up to her to look for prospects and actively go for them.
I wish that my mother had told me that it was largely up to me to put in the effort and socialise/date with intent. That is not what she told me, but rather she said "it will happen when you least expect it". 🙄
Bullshit, bullshit (exceptions withstanding). You must be proactive. That's why I say it is harmful to spread this damaging idea.