Has the cost of building software dropped 90%?

> I'm sure every organisation has hundreds if not thousands of Excel sheets tracking important business processes that would be far better off as a SaaS app.

Far better off for who? People constantly dismiss spreadsheets, but in many cases, they are more powerful, more easily used by the people who have the domain knowledge required to properly implement calculations or workflow, and are more or less universally accessible.

I’m yet to see a spreadsheet workflow successfully replaced by something else.

Streamlit apps or similar are doing a great job at this where I'm at.

As simple to build and deploy as Excel, but with the right data types, the right UI, the right access and version control, the right programming language that LLMs understand, the right SW ecosystem and packages, etc.

Are they actually as simply to deploy as Excel? My guess would be that most streamlit apps never make it further than the computer they're written on.