Then shouldn't it be in every building? What I mean by weird is that it's present on buildings that don't garrison, and absent in buildings that do. I'd add it only on buildings that garrison because if one at some point has only buildings that don't garrison then the alarm wouldn't do much.

https://code.wildfiregames.com/D1718 (Phabricator is the software we used before Gitea)

Isn't the bell intended to be a general alarm no matter if units can go inside that building or not? It does not say "come home to me" but "go, look for shelter" I fdo agree that we should have a garrison of 1 to a lookout. It used to be the case in earlier versions of the game. The intent was to permanently occupy a gaia lookout and keep it (avoid decay). This has changed a while ago. Now you can claim a lokkout and it will not decay.  

What's this?: Maybe something that is not public?

We gave cretan arches a slight distinction due to their shields.  Also Peltasts vs regular javs.