[SirSavary]

If I can add on to this, I'd say it's okay for new devs to use a tool such as prettier without knowing how it works as long as they know what it's purposes is and why they're using it.

I remember when I first started programming I often used tools without understanding what they did simply because a guide or Stackoverflow answer recommended them. It led to a lot of problems down the road, e.g. Googling for "how to add two numbers using jQuery".

When I try to teach junior devs, I'll let them use User.find... as long as they understand someone else is writing the SQL for them and that it isn't some magic database tool ;)