[SAI_Peregrinus]

> So no via is necessary; just connect directly to that pin on each layer (kicad probably did this for you automatically). This trick works with all thru-hole pins.

Note that without a plated through hole (vias are small plated through holes, those designed for component legs are bigger) the solder will only adhere to one side. For mounting large components where vibration may be a problem this will make the pad weaker & more likely to lift off. A plated through hole lets the solder flow through & bond to pads on both sides. So you sometimes do need plated through holes.

Otherwise I agree. These days 4-layer boards are so cheap it's often worth just dedicating an entire layer to ground, and one to power. E.g. Signal, ground, power, signal. All your ground connections become vias. Most of your power connections are vias to a lower inside plane. Your signal traces are available to probe & rework easily. You get a bit of distributed capacitance from the power & ground planes.