What's the purpose of multiple layer PCBs (i.e. 4 layer,) when many manufactures like JLCPCB can't produce blind/buried vias as they just support through-vias?
Let's say I have an SMD component with a GND pad on the top layer (1st layer) and the GND plane is on the 2nd layer. What is the purpose of this 2nd layer when I am only able to connect the top layer SMD pad to the bottom layer (through-via) and not to the 2nd layer?
Somehow I am misunderstanding something since many use this kind of design with GND and VCC inner planes, but the wiring/connection from those layers to the SMD pads is something I don't get right now.
Can someone help to break my barrier?