GND doesn't show in netlist, making ground plane impossible

[Piotr]

@Rayou23

So your main recommandation would be to try and make the holes in my GND plane smaller, even if it leads to more of them ?

I can confirm. It is valid recommendation always.
But in amateur designs may not be taken very seriously.
I used to design my 2 layer PCBs with all bottom being GND with no breaks at all.
Here is an example of such PCB:

Approaching PCB track routing for a newbie

Positioning for me is the main work in designing PCB. If each element is where it is needed than routing is simple. Till now all my PCBs are 2 layers and all of them have GND plane taking 100% of bottom layer. So except GND I design my PCBs as 1 layer. I use microcontrollers in QFP packages without thermal pad at bottom. This allows me to go with VCC under the microcontroller and go out through all corners and all VCC pins. That way GND and VCC don’t disturb my signal connections. At all digi…

Blue is everywhere except one 3 pin THT connector.
All vias are GND.