Based on my understanding, wireless signals are lights. Why can I use my gadgets inside a room?
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It depends on the technology you are using.
It’s the system design choice.
They select if they want line of sight (los ) or scatter system.
Then they select frequency and type of antenna correspondingly.
Even with same frequency of radio waves we can get los and non los communication by varying antenna design.
And radio waves are also energy carrying and they lose energy as they propagate.
The loss factor depends on frequency/wavelength of radio wave and obstacles in the path and many other things.
Eg: take GPS it is supposed to work in line of sight for great accuracy.
But in our cities that’s not possible as we need min 4 satellites for location data. So we rely on other methods since we receive those satellite signals non line of sight.
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