On all hardware desks, it’s natural to start with faders down and build mixes ‘upwards’. Even then it’s easy to get enthusiastic, always adding more, adding more and eventually running out of any place to go.
I think I can see why Cubase and other DAWs tend towards setting faders to 0db - otherwise many new users would struggle to get started with signal flow at all. Make a new channel and the sound is already there - it ‘works’ - it’s instant!
But it merely compounds the problem when it comes to mixing because you are starting off most channels only just below the red zone.
I long ago learned when balancing sound to ask myself the question, ‘What is too loud?’ not ‘What needs to be turned up next?’. I’d go so far as to say that I think getting this gain structure and judgement right is one of the most important aspects of the art of sound recording and mixing. More important than exotic plugs and EQ and as important as composition and arrangement.
Remember, this doesn’t mean your final output mix is quiet, merely that you can get to a good balance more easily.
My thanks to OP. Aljames for giving me the chance to soapbox!