You know who really loves for you not to overthink things? Predators.
What awesome life advice that is.
There is a certain containing context within which you could validly say "don't overthink it", but that advice itself only comes as a result of thinking.
So what you actually do is you think ALL about it, and the result of that thinking shows you how and where to pay the most attention and demand the most data and exert the most control, and where not to, and how to tell the difference.
I can not imagine having a kid and advising them not to think too much about this topic.
"Whatever happens happens, it'll probably be ok somehow. This isn't a chemical emotional landmine waiting for every human to step on or anything. It's not like naivete in this area is the root cause of 100 different ways for you to hurt yourself, or hurt others, or be hurt by others. It's not like there multiple whole classes of violence called domestic abuse and crimes of passion or anything like that."
If I had a daughter who was neurotic and overthought things, and I wanted to help her avoid the harm that this can cause in this area, the talk would not be in praise of ignorance.
The talk would be about over-optimization and mis-optimization.
The fix is to be even less ignorant, to be aware of this natural pitfall, and to have an understanding about stepping back to see a wider view of something and get perspective, identify what actually matters, and avoid sabotaging the important goal (being happy) by optimizing for the wrong things (any number of details).