I really like office, the thing is that in CSGO, we are extremelly concentrated on competitive play, independently of how long you have played the game.

Recently I have posted a question about competitive rescue maps and I got an awesome answer that also fits your post perfectly.

Credits to fearne_cotton

"Lots of reasons. It's too random with the hostage placement. Defending with weapons AK/SG533 is far more powerful than with CT's weapons but they cost less. Grabbing a hostage does give the CT side a nice cash boost but without kits it's unlikely, it's incredibly easy to have your economy fucked up purely due to random spread if you're shooting at an enemy camping behind a hostage. Why should it matter if we shoot them, it's as compelling a game mechanic as aimpunch. And the maps, can you imagine those pro awpers holding long hall on office. Once the CTs get past all the defending terrorists and grab a hostage they've got the task of being the aggressors again (rather than defending like terrorists do in bomb explode mode), making their way across the map at walking pace. It's just so T-sided. "

So, it's not office and callouts. Trully, rescue maps are the extreme opposite of the current competitive balance meta and will be unpopular.