The modular stack can work
Specialist tools are often excellent at the individual job they were designed to do. A modular stack also lets operators choose best-of-breed products.
The hidden cost is coordination
Duplicate data entry
Different sources of truth
Manual handoffs between reservations and operations
Team context spread across apps
Reporting assembled after the fact
What an operations-first PMS consolidates
The strongest case for consolidation is not having fewer subscriptions. It is connecting the reservation to the property, guest, turnover, team activity, expenses and performance so today's operation can be understood from one place.
Keep specialist tools where they add value
A PMS does not need to replace every specialist product. Pricing, accounting or other specialist systems can remain part of the stack when they provide deeper functionality. The PMS should clarify which system owns which workflow.