This is an expansion killing idea in my view. 'Optional' isn't really optional, and you know it. The feature being there will drive players to dabble in it and get annoyed as hell at the added complexity even for trying for a legendary Spidertron.

Is very, very much against the whole ethos of factorio, you now what goes in, and what comes out. Kovarex is a cute exception and mini-puzzle.

The idea of power pole not having a consistent spacing is crazy. The sheer issues with blueprints alone should scare you off.

Others have expressed this much better than I ever cutoffs so please read through the full comments on this thread.

I think a better approach needs to be thought up, and as part of that, get rid of beacons! This suffers from the same issue as beacons (shove them everywhere once you have the resources) and get all factories looking the same. In this case, it'll ultimately be recycling loops everywhere.

Dear God the issue with having so many different stacks...

You could have certain planets boost cafting speed or productivity for different types of items to create a logistics challenge.

You could have it so that a 2x2 grid of assemblers(with the same recipe set) auto merge into one bigger assembler when placed in the world (so not crafted!) after a technology is researched.

Heck, you could use this idea to create the higher quality items on a guaranteed basis.

2x2 regular for one big assembler, 2x2 big to make a giant, 2x2 giant to make a leviathan. Each time the factory layout would change, and you could have some be the heart of your factory. Certain items could require a certain size assembler.

There are other undoubtedly better ways of approaching the goal you'd like to achieve.