Mad_Cyril just a ddj400 controller
I would assume Pioneer haven’t spat out a completely useless item here, so yeah, learn the thing inside out, know what every dial or button does and then you can start to get an idea of it’s limitations.
As regards the bigger picture of your next purchase and dials vs faders, do you know anyone you can borrow a proper mixer off? Even if it’s only for an evening? That would be my move.