Spreadsheets are useful tools. The question is not whether one is better in general, but whether the way your team works has outgrown a single file.
Spreadsheets work well when the work is small
A spreadsheet can be the right starting point when one person owns the process, the data is limited, and the team does not need many people editing the same record at once.
Shared systems help when coordination becomes the work
The moment several people need current information, clear ownership, and a reliable history, the process may benefit from a shared system. The value is not the software alone; it is the shared view.
Start with the workflow, not the label
A business does not need an ERP label to need better operations. Start with the process that creates the most confusion, repeated entry, or delayed decisions, then choose the smallest useful system around it.