Someone who knows AC well recently told me that everything in AC is in silos and the silos are very strong.

So someone gets handed a project to go build an eUp website. Their job is solely to build an eUp site. So, they build the eUp site. They're not required to integrate it with other functions of the website. So they don't, they just make it handle the eUp functions. Same thing with Altitude and so on.

It all starts to make so much more sense when you think about it in those terms.