My last job had a desktop CNC called Volterra I think. It would squeeze out conductive ink, bake it, drill holes, and lay down and reflow solder paste.

It was expensive and performed terribly.

I think there really isn't any good way to improve on breadboards. Breadboards, in fact, are the improvement. They're called breadboards because we used to literally drill pieces of wood and do wire-wrap construction on the other side.

Breadboards are good enough for the kind of prototyping they're for. Spring loaded contacts are about the best you can get for removable parts. The signal integrity isn't that bad at modest speeds.

In today's world, the next step up from a breadboard is custom PCBs. You can have a set of five shipped from China for the same price as a set of breadboards. There's no real need or reason for anything in between so long as PCB manufacturing is so disgustingly cheap and fast.