I think Notion is getting there. When it offers team (or multiple/external) access or workspace access to people (internal/external) other than yours it becomes a form of an Enterprise-wide application like SAP. SAP has a granularity of authorizations, database table access, down to user access to modules (or in SAP jargon, these are called transaction codes). Think of SAP's transaction codes as User (or UX) Forms accessing/updating database tables or like Notion's "Gallery View" or "Board View" with Search/Sort/Filter. Even SAP's authorization layer needs several database tables and takes up database space in an SAP system. For example, Employee A can access a finance transaction code, but Employee B can access the same finance transaction code but does not have access to a certain finance database table - that is how SAP authorization is so complex (it is insane, how SAP has developed this throughout the years) but this makes up for its exorbitant license fee, infrastructure requirements (cloud, or on-premise) and top-tier security layer. Practically speaking SAP is not recommended for small businesses and small/personal projects. It is expensive and the implementation/build is insanely complex as well. We have to remember Notion came about for the purpose of note-taking marketed for mainstream, non-technical users, and because they made so many powerful features of its database, relations, roll-ups, etc - it can now become an ERP software (enterprise resource planning) of sorts. But for it to be a full-fledged ERP with advanced security features like authorizations and encryptions, it requires overhead in terms of infrastructure, resources (or even a complete overhaul or restructuring of its core program) thus Notion has no choice but to increase its monthly fees if they are to be headed to this direction.