You're seeing the top of the trees, you can't remove trees from the top, you'll need to take them down from the ground.
If the chainsaw doesn't work. Try Nobelisk.
I like the base concept... nice approach A Set of stacked belt loops for various items and you just branch off what you need, and drop off what you produce.
I use the same basic idea of a stair of belts to feed into my assemblers and manufacturers (and outputs so I can tweak), but I don't make closed loops, all the belts have an endpoint. Never thought to close the loop and make a "carousel".
It would work in some parts of my factories, just too many are at or too near capacity to make it work. Also: not enough belts for everything if you are doing supercomputers and heavy frames.
Belt speed limit must be problematic tough, unless you don't have large enough production anywhere that it exceeds belt capacity anywhere.
I need 4 dedicated Mk4 belts just for crude oil (60 refineries, waiting for belt Mk5 to enable the already built but currently dormant 20 ). Then 4 exiting belts for plastic and rubber (because of belt capacity, and the same issue for caterium wire of which I need several to get 2000ish caterium wire/min, and regular wire also which goes way beyond the belt capacity.