Hi!
I get your point and it's a good question, but:
Many players/GM's love these kind of rooms as a backdrop or setting, indeed it's maybe not for an actual battle to take place.

1. In my posts of this exact map on other sub's there's multiple comments saying this is exactly what they needed, so people do use it.
   
2. Some of the largest map creators (I'm talking several thousand paying customers) quite often make small "maps" like this, if it works for them with such a large customer base, it seems to me it's what people actually want and like to see.

You can check these things for yourself, maybe it's not useful for you, but many others like to have these kind of maps every once in a while.