Then they are taught lies that they will have to un-learn later in their studies. If you don't understand Eienstein's theories, you don't understand combustion.
There are degrees of understanding.
The object, though, is to avoid mis-understanding.
This has been reiterated several times.
No they aren't. They just aren't taught the whole thing. It's the difference between knowing who won WWII and knowing the casualty levels of all involved nations. It's not a lie to teach kids just the basics, but the Bohr model isn't just the basics, the Bohr model is junk, it's how we used to think but learned better. Why make the kids go through the same relearning process our scientist in history went through? Just wasted effort.