You would need a VERY specific use case for these with USB4 40Gbps around the corner. USB4 is loosely based on Thunderbolt3(same tech, but different specs).
Not really. USB4 40Gbps will still need to be similarly optical for these lengths to achieve the same speed. Copper over these lengths will degrade rapidly. You also couldn't bury them underground without grounded conduit. These, being optical, can easily be buried underground in ungrounded conduit and be safe to use. The prices are very similar to that of fiber networking cables, which are used even for short distances at these speeds (or lower). The fact that these run on very low power with a very high rate of speed is worth focusing on it now and worrying about USB4 when it's as widely adopted as Thunderbolt 3. I would be interested in knowing the processing speed of the chips inside the cable to convert the signal. I would imagine that there is a decent amount of latency if they're too slow.