Both of these were side effects. The guild permissions were reworked as part of the implementation of communities, without any thought to how they would affect how guilds manage their members. And they really don’t care about garrison monuments.
But portals? Seriously. A new portal is built using a template that allows them to insert an image and specify where the person taking the portal will end up, be it at another portal or just deposited somewhere. They changed the portal in Orgrimmar so it now deposits players on the dock instead of in the portal room. This isn’t like a mob type that got adjusted in the entire game to fix one quest and is now acting up in different contexts.
They know what they did because they did it on purpose to inconvenience players.