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The nature of open source community projects is they’re generally slower to get hardware support than commercial developers. That’s not a knock against openwrt (or any project), just the reality. 6E support will probably land once WiFi 7 is on the horizon, so if you approach things like this, you’ll always be waiting.

Is 6E that much better (in applications where openwrt is typically used) than 6 to justify waiting for 6E?

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Yes. 6 GHz spectrum has 7 channels that are 160 MHz wide.

Contrast that to the 5 GHz spectrum which only has 2 channels that are 80 MHz wide (excluding DFS). DFS is not an option in many places, and even the US only gets 1 channel that is 160 MHz wide (also DFS).

5 GHz spectrum is almost always congested and gets half the spectrum width.

See: https://www.duckware.com/tech/wifi-in-the-us.html#wifi6e

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