Most don't even have central databases, they just sit on Access and get copy pasted around like spreadsheets.
While the UI part of Visual Basic was fast and easy, so is writing a React frontend that just stores data in browser LocalStorage, has no authentication, no logging, no monitoring, no tests, and deployment is emailing an updated js file to customers.
The complexity of modern development enables 10-100x better productivity across all aspects of: safety, security, monitoring, error handling, maintenance, and new feature development.
I can whip together a modern website that ticks all these boxes. To achieve the same in VB+Access would be monumental.