I'm not sure boredom is good for you. I think boredom will often lead your brain into doing things that are good for you, but just being bored doesn't seem like something beneficial to me.

I'm not sure what I would gain by sitting in a doctor's office waiting for my appointment and being bored vs. sitting there with my phone reading/watching something.

The problem (in my opinion) comes when you start replacing everything you do with just scrolling on your phone. Like if I'm bored at home I just scroll TikTok instead of playing a sport or learning a new skill.