The problem with them all being similar is that would mean they don't reflect their inhabitants. The same as no two rivers flow the same, no two schools work the same. They nominally accomplish the same task in similar ways but will have a fingerprint in how its done. There's a degree of practicality that comes with a school that can be met with common resources, but it's still apparent communities don't want modular schools (regardless of individual opinions).

There's a long list of reasons schools aren't just a cleared field with a bunch of mobile-unit classrooms thrown out there despite that being the most cost-effective way to house classes.