can you elaborate on the 'don't scale part'? because apps in 90's don't see 'smaller' than webapps now

Typical Delphi or VB app didn’t have model, instead it read database and put everything into controls (aka data binding). The it kept logic in event handlers.

This code is a) hard to read and understand because logic is dispersed across event handlers and b) causes a lot of duplication. Over time codebase evolves into a mess.

This is not the only way to create a mess. But this one works every time.