Yes, I have a similar question.
I was really hoping that my new 660HD's would support DFS channels in the USA -- but they don't. Neither did my prior 225's and 245's.
Please, TP-Link,
add 5GHz DFS support for your Omada product line -- at least UNII-2 and ideally some/all of UNIT-2 Extended.
https://www.cisco.com/en/US/docs/routers/access/wireless/software/guide/RadioChannelDFS.pdf
https://www.networkcomputing.com/wireless-infrastructure/dynamic-frequency-selection-part-3-channel-dilemma
All modern STA's in the USA support these extended DFS frequencies.
Thank you,
Jonathan