Signal strength indoors vs outdoors

I happened to notice this checkbox on Unifi yesterday. I wonder how many people tick the box if they're supposed to? This AP is actually outdoors but I've forgotten to check it! This checkbox disappeared from RouterOS a while back. Is it now inferred by the fact the device is designed for outdoors and from the country configuration table? What happens if you want to use an outdoor device indoors? Also, I don't recall any questions about country and therefore Tx power limits. Is this possibly why signal strength is such a hot potato on Mikrotik? Do Unifi play fair and limit (say) UK power?

I would say MT plays fair and abides the rules quite strictly in latest ROS versions.

You need to set installation on Mikrotik as well, it's set to indoor by default: WiFi - RouterOS - MikroTik Documentation .
The docs suggest that it limits only the radio channels

Not completely.

On indoor device you don't have the option as far as I can see on the devices I have.
So it's indoor and nothing else.

That's also what's kinda hidden in the message from Help pages

Devices installed outdoors will avoid use of indoor-only radio channels.

This setting is only for devices capable of being installed outdoors.

I see it on wAP AX.
I don't see it on AX2, AX3, cAP AX, AX Lite, ...

Power levels are regulated based on frequency.
E.g. wAP AX

[xyz@wAP AX Bureau] > interf wifi radio/reg-info number=1
country: Belgium
  ranges: 2402-2482/20dBm/40MHz            
          5170-5250/23dBm/160MHz/indoor    
          5250-5330/23dBm/160MHz/indoor/dfs
          5490-5730/30dBm/160MHz/dfs       
          5735-5875/14dBm/80MHz
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