When the inbox lives on a phone, the CRM lives on a laptop, and the calendar lives in a booking tool, nobody has the full picture. Messages arrive with no lead context. Appointments get booked with no linked conversation. Follow-up depends on the owner remembering.
One record, three views
The fix is not more integrations. It is one lead record that surfaces its own conversations and its own bookings, so any team member can pick up any lead with full context in seconds.