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It's the cover of a Tokyo manga. Anime and manga do have mulyiple styles from simple to slightly more complex.

Although I might agree with you on this one... that they might have broken some "rules" of mange as it's the cover giving them more artistic freedom

yeah, they often spend a lot of time on the cover, and don't necessarily match the style with anything else.

I think that there is beauty in that simplicity of normal anime style though. especially when you realize that they've managed to develop all these art styles while killing themselves constantly to make deadlines.

That is true.

Well not only that. even tho it looks simple, it is still quite hard to achieve that simplicity and still portrait everything it portraits.
Anime is harder to draw than I expected