Yellow belt is limited to 15-items/sec, Red 30/sec, Blue 45/sec. Trains are more complicated, but intersections are usually limited to 20 to 40 trains/minute, depending on intersection design.
This means that even a train track is going to be limited to ~30ish trains/minute (not because of the track itself, but because it will be bottlenecked by some intersection down the track somewhere).
------------
Mixed just allowed you to utilize those belts more efficiently. For any base smaller than 45-science per second (among the 6 endgame sciencies: red, green, blue, purple, yellow, and white. Military isn't really needed once your defenses are thick enough), aka: a 0.45 rocket-per-minute base or smaller, a __single__ blue belt can theoretically support all of your labs.
Of course, sushi belts require combinators, counting of items, and more. Its a bit complicated. But if you sushi-belt, you get some simplicity benefits (at the cost of combinator complexity).
Yellow belt is limited to 15-items/sec, Red 30/sec, Blue 45/sec. Trains are more complicated, but intersections are usually limited to 20 to 40 trains/minute, depending on intersection design.
This means that even a train track is going to be limited to ~30ish trains/minute (not because of the track itself, but because it will be bottlenecked by some intersection down the track somewhere).
------------
Mixed just allowed you to utilize those belts more efficiently. For any base smaller than 45-science per second (among the 6 endgame sciencies: red, green, blue, purple, yellow, and white. Military isn't really needed once your defenses are thick enough), aka: a 0.45 rocket-per-minute base or smaller, a __single__ blue belt can theoretically support all of your labs.
Of course, sushi belts require combinators, counting of items, and more. Its a bit complicated. But if you sushi-belt, you get some simplicity benefits (at the cost of combinator complexity).