you don't really have to be granular

isn't that one of the key points of polylith? atomic modules?

to me the selling point is that it's easy to granularize for reuse across deployables if and when you have to

but it isn't forced on you - you can have a workspace with a single project and a single base starting out

My feeling is that Polylith is worth adopting as soon as you're building more than one deployable application from a single source repo.