[kapep]

I don't think "Microkernel Architecture" is the same as "Modular Architecture". I've only heard the term "Microkernel Architecture" used for systems that have clear public extensions points that enables users to choose which plugins to run or even add third-party plugins.

"Modular Architecture" is more broad in my opinion and rather a description of internal structure. A "modular monolith" for example is modular but doesn't necessarily have a "core" nor is it required to be extensible with plugins by users.