DP2.0 is the only interface that supports 8k monitors today without loss of quality up to 36 bit color depth at 60Hz. HDMI 2.1, even in its full version with 42Gbps (only useful data, excluding service traffic), does not even handle 8k@60Hz 24 bits. Its destiny is 4k monitors and household appliances.
To date, despite the fact that DP 2.0 in its full version was adopted almost 3 years ago as a standard, all iron manufacturers have deceived consumer expectations, because. none of the Intel/AMD/Nvidia trio provided DP 2.0 80Gb/s (77Gb/s payload).
Zen4 (and discreete gpu) only supports the poor UHBR 10Gbit/s mode for DP2.0 (I.e. 40Gb/s including service traffic and even less without it, I.e. weaker than full HDMI 2.1).
Alas, today there is no hardware that actually supports lossless 8k data transmission at 60Hz (not to mention a higher frequency) with a color depth of 24 to 36 bits with full UHBR20 (20Gbits to lane) mode. The future of 8k never happened. Although formally discrete video chips of even an average level 12 years ago were able to pump the necessary level of data in memory, sufficient to support 8k monitors in 2D mode. Exactly what you need for high-quality output of text, vector graphics and photos on 27-32" screens, where 4k is clearly not enough in terms of pixel density (ppi) at a distance of 50-60cm from the screen.
In terms of cable length, both HDMI 2.1 and DP2.0 (which they don’t put in projectors or TVs) have long been uncomfortable without switching to optics cable. Projector owners are well aware of where the typical distances are 8-15m.
The data signal should long ago be transferred to an optical cable, where all restrictions are removed at once (for example, a noisy gaming unit can be sent to the back room of the house, lead a 15-30m optical cable to the monitor and work and play in complete silence). But the industry keeps pretending it doesn't need it. But consumers need it.