It just seems a bit odd that I can actually define...

# getting-started

[poohbar]

It just seems a bit odd that I can actually define "root" classes in any folder I want.

[diesieben07]

You can, but it's discouraged. IntelliJ also warns about it.

[poohbar]

I am getting no warning about it

[diesieben07]

Probably because you don't have any package statement at all.