A newsletter with a healthy list is generating buying signals every week that go straight into a dashboard nobody acts on.
Someone who clicked your booking link and did not book is the single most qualified person you will touch this week. They were in the flow, they got to the page, something stopped them. That is a person worth one personal message.
Almost nobody sends it, because the data lives in an email platform's dashboard and there is no moment in anyone's week when they look at it.
The entire advantage here is that the message is genuinely personal from a founder who has read what this person engaged with. An automated draft, however good, converts this into a slightly better newsletter send and throws away the reason it worked.
Repeat clickers and repliers go to the top. A flat list of everybody who clicked anything is too long to act on, and being too long to act on is how this data ended up unused in the first place.
Skills compound. These are the ones we usually install alongside it.