> And you think the same problem wouldn't exist with 6ghz?
Wi-Fi 6E and later standards that unlock 6 GHz are designed to mitigate contention through several dynamic power management and multiplexing capabilities: TWT, MLO, OFDMA, improved TPC, etc. While these things aren't somehow inherent to 6 GHz, the 6 GHz band isn't crowded with legacy devices mindlessly blasting the spectrum at max power, so it is plausible that 6 GHz Wi-Fi will perform better in dense urban environments. The higher frequency also contributes because attenuation is substantially greater, although in really dense, thin-walled warrens that attenuation won't solve every problem.
I know if I had noisy Wi-Fi neighbors interfering with me, the few important Wi-Fi only devices I have would all be on at least 6E 6 GHz by now, not only because 6 GHz has fewer users, but also in the hope that ultimately, when the users do appear, their devices will be better neighbors by design. I don't actually have that problem, however. The nearest 5 GHz AP I can actually see (that isn't mine,) in Kismet (using rather high gain antennas) is -96 dB, and my actual APs hardly ever see those at all. I've yet to actually detect a 6 GHz device that isn't mine. I known there are a few because the manufacturers and model numbers of many APs are visible, but between the inherent attenuation and the power level controls, I don't see them.