Gpencil quick tutorial

I’ve been using Blender over 10 years, a new ara has been added for a while now Gpencil.
And although i like to paint art and draw, so fat i’ve not seen a practical reason to use it in my work.
I work as an engineer, designer, and am still mostly impressed by Cycles, for its realism.
I have seen various cartoonish animations (i do like them) but they’re not practical for my work.
Still since it draws so much attention in blender development I am wondering, am i missing the boat here. I’d see great value in Lanpr (to get various engineering style improved drawing. Do people also use Gpencil in product design development.

I now kinda wonder this, if you now some examples where gpencil was used for product design let me know.