Notion is a flexible workspace. For a small agency that is usually the appeal and the risk: it can hold SOPs, proposals, client notes, and a light CRM, or it can become a wiki nobody opens.
When it earns a place
It earns a place when the team needs one shared home for documents without buying an enterprise suite. Operating notes, kickoff checklists, and decision logs belong here if someone owns the structure.
It does not replace the independent agency operating system. Write the rhythms first; then put the pages in Notion.
Where it fails
It fails when every meeting produces another database and nobody is accountable for the current version. One source of truth is the rule. If project dates and owners live in Notion and in chat and in a PM tool, you have three truths.
Use Asana when parallel client work needs ownership and timelines more than documents. Use a real CRM when the pipeline still lives in inboxes — see why small agencies should stop using their inbox as a CRM.
Practical rule
If a page is not used in a weekly or monthly rhythm, archive it. More on this topic: Operations and Tools.