[Question] Why do the OpenWRT guides mention wnm_sleep_mode?

[rany2]

If you look at the guides for usteer and DAWN, they both mention that wnm_sleep_mode should be enabled; but I cannot understand why that is the case. Guides in question:

• https://openwrt.org/docs/guide-user/network/wifi/usteer
• https://openwrt.org/docs/guide-user/network/wifi/dawn

If anyone could provide clarification on why the guides tell you to enable them, I'd really appreciate it. I checked and OpenWRT/hostapd don't appear to do anything more than what the option name suggests.