Also, TB5 cables, while downward compatible to TB4, are made to higher standards. That’s why you may have better luck and longevity with a TB5 one. 
Unfortunatly not, TB4 is an addition to USB4. The Framework AMD laptop has USB4 ports, but none of them has TB4. They support TB3, since TB3 was made public available by Intel.
The thing is, network cables are still dumb cables. You could cut them in half and put a new plug on it.
USB4/TB cables cannot be cutted, because they have electronics in each plug to do the handshake for each side.
Correct, Thunderbolt 4 is basically USB4 except with some features (that are optional on USB4) made mandatory and a special certification from Intel.
Though Framework has said that the USB4 ports are fully featured, so they are effectively the same as (and compatible with) Thunderbolt 4.
And yes. Networkcables are passive, All TB cables are active.
Pretty sure the e-marker is only on one side of the cable so cutting would theoretically be possible but quite hard and extremely inconvenient.
USB4/TB3/TB4/TB5/-cable are all cutable and able to be resoldered, BUT the endresult is questionable for performance and endurance.
Ive cut and soldered a lot of passive and active HDMI and Displayport-cables in my career. Can function, doesnt have to. If you have the option, dont.
I was on yachts where pulling a new cable was sometimes only an option if you want to tear apart a lot of very expensive panelling, and so we rather tried cutting and setting a new endplug first.
But if there was the option to not do that, and you can just use a new cable… by grabthars hammer, do that. 
(in todays world, we would just pull patchcables and use lan-to-hdmi/dp adapters)
I as being a smartass, while technically correct it is however extremely unpractical XD.
I think I saw something about dp to fiber adapter that use actual standard connectors recently.
Yupp, we tried to use these too, but they had two known drawbacks back then. One ofc being that since these are fiber, you have to think about bendradius and they are really delicate. Second being we found none that worked reliably at a reasonable price. Working for bang & olufsen that time that means something.
But the world span a few times since then, maybe thats different now.
That is of course a concern but I’d personally much rather worry about bend radii than terminating my own dp cables.
The yacht use case made it sound like cost wasn’t a huge factor XD
The ones I saw made it sound like they were a very new thing.
i think i saw them 7y ago for the first time? But we were pretty close to everything brandnew in the industry/prosumer anyway.
And well, we still tried to be cost-effective, especially if you have a lot of cables. But yeah, sometimes a viable solution was to just throw enough money at the problem.
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