The problem is not volume, it is scatter
Most agencies do not have too many client messages. They have the right number of messages spread across a personal inbox, two people's phones, a Slack channel, a shared mailbox nobody reads and a project tool with a comments feature.
The cost shows up in three places: onboarding a new account manager takes weeks because the history lives in other people's heads, something gets dropped whenever someone is on holiday, and every client dispute becomes a matter of opinion because nobody can produce the thread.
Putting the conversation on the client record fixes all three at once, and it is the least glamorous feature in the product.
