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For those who don't know: Vias are not only used to get an electrical connection from one side of the PCB to another.

You also need them to keep radiation in check and often to move heat away.

With this technique, good luck getting through EMC testing for anything but trivial circuits.

> You also need them to keep radiation in check and often to move heat away.

Hence my post saying vias are useful at all stages of prototyping.

> good luck getting through EMC testing for anything but trivial circuits

It's for prototyping! Nobody says you can't add more in a board spin.