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IIRC wifi6 added the option for backplaning to be a different frequency, but not everyone implemented it. 6e even added 7ghz but basically nobody implemented it. So even with brand new equipment, you were super at the mercy of your end user devices and whether or not your mesh was physical or wireless and whether or not the mesh nodes themselves supported the same backplaning channels.
Yes. It’s such a bad practice the fucking White House released an official memo (M-22-09) telling people to stop doing it as part of executive order EO-14028 (federal zero trust strategy). It applies as a rule to all government and military entities and therefore has been carved out in exceptions for FedRAMP and other compliance frameworks. Stop forcing people to change their fucking passwords.
https://www.whitehouse.gov/wp-content/uploads/2022/01/M-22-09.pdf