Well let's see. What about other skills? Should we leave the piano playing child alone? Maybe tweak her playing years later? When it comes to swinging a bat, the most attractive option to hit the ball hard turns out not to be what elite hitters do. Excepting a few, they don't figure it out on their own. Maybe your kid will be one of the few. What if they aren't? Maybe they are just a poor athlete who wants to hit better in rec league. Maybe your kid is a great athlete with superb vision and a terrible swing. What's a parent with a frustrated broken hearted kid who can't hit supposed to do?
Having said all that, the state of swing instruction is poor enough we might very well be ahead on average if everyone just quit doing it. It IS getting better due to the ready availability of good swings to study on the net but at a snail's pace.
Here's the thing. If your swing takes more than .16 seconds (preferably .13) from first move of the bat head into the swing plane till contact, you are going to disappear against good pitching unless you are a really great guesser. If you have a quick swing, as defined in the previous sentence, and it's repeatable AND you can put it where you want to, you should have a lot of fun. If you have the standard youth rec .23 second swing you are going to hit the ball hard occasionally. Very occasionally against good pitching. You just have to commit too soon with that long of a swing. I don't think that's arguable. You can do the math and set balls in the dirt .23, .16 and .13 seconds from home plate and you will quickly be convinced if you aren't already. You can measure this swing quickness with Zepp or with video by counting frames.
All this begs the question, what do those hitters with .13 second swings have in common mechanically if anything? That's where the conversation turns into a mess. That's why I laugh when anyone says "good" or "proper" or "accepted" swing mechanics. There is no commonly accepted good, proper or accepted agreement on how to swing a bat. Usually discussion of such devolves into a religious argument.