I'm not sure why Lego themselves didn't make Lego-based breadboards. Seems like a fairly straightforward idea.
Flat breadboard with conductive "lanes". Bricks with electric parts. Flat pieces with conductors. Conductivity in bricks would normally go from top to bottom, so you could easily stack things or connect them from the top side, without adding stuff to breadboard.
Would be great even for "adult" prototyping. No more wire spaghetti or bent pins.
Bonus points for "empty" bricks you could solder your own parts into. You do it once and get a reusable part.
They've had drag-and-drop programmable controllers for at least 18 years, along with electrical bricks with motors, batteries, speed controllers, lights, light detectors, touch sensors, etc. Lego mindstorms.
Flat breadboard with conductive "lanes". Bricks with electric parts. Flat pieces with conductors. Conductivity in bricks would normally go from top to bottom, so you could easily stack things or connect them from the top side, without adding stuff to breadboard.
Would be great even for "adult" prototyping. No more wire spaghetti or bent pins.
Bonus points for "empty" bricks you could solder your own parts into. You do it once and get a reusable part.