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I was pretty sure fiber was bi-directional so you can always saturate the same fiber with all upload or download based on demand. Copper wire can't do this so they use most of their last mile copper for download since that is what most people use the most of.

Yeah but my point is why can’t it do the same as Wi-Fi (since technically coax is just radio anyway) and dynamically allocate bandwidth for upload or download depending on usage?

technically possible, would require a ton of upgrades to the infrastructure to support such a thing, and probably just not worth the investment for these companies right now.

1) The filters and amplifiers that split upstream/downstream/video are typically hardware, tuned for specific frequency bands.

2) The cable is a shared medium (like wifi) so it’s not just a matter of what you’re doing, but what everyone else is doing.

It possibly could be. It has been 15 years since I worked in the CATV market, so I'm not totally up to speed on the nuances of the latest platforms.