On the surface, this seems like a negative, but if you're in a crowded apartment building, it can actually be a major benefit. Even if a bunch of your neighbors end up using it on the same channel as you, you won't experience as much interference because the walls will attenuate their signals.

Of course, a single AP might not reliably cover your entire home in 6ghz, but you can always fall back to 2.4 and 5ghz and/or get more APs.

Additionally, WiFi 6 (and 6e) is better in general at detecting neighboring networks across all frequency bands and reducing interference automatically.