Working With Human Error
If your workplace incorporates humans then there's always the risk of human error to contend with. In many instances it's not a case of IF but WHEN.
A year, five years, 10 years - tech evolves and improves greatly over time. You should be making sure your emergency alert systems evolve as well.
Customisations Value You, The Customer
Your suppliers should be valuing your business with customisations and integrations that improve your processes, facilitate system management, and deliver ROI for your business.