Thanks for playing!
Fair enough, the ability to speed up the belt is basically just customisation. But once you've reduced triangle loss to 0, that's when you can really invest everything into making it super fast, as there's no penalty anymore
you could have other shapes
a source material thats making the shapes and upgrades for it (less triangles made)
you could add workers that have an upgrade-able chance to catch triangles or other shapes
colors could mean something and have different upgrades
you could have a factorio style belt that you have to architect your factory while you're playing the rest of the game.
This idle game went above and beyond in some ways: https://lectvs.itch.io/idle-badger