And many did. There were entire business suites in BASIC and Who can forget "Your Faithful Camel"?
Even then, the threshold was low, and it was said: "It's easy to get started but anything big and serious wasn't (and isn't)
Anything "serious" involving data structures, concurrency, locks, a bazillion other things, takes skill and experience to get right. As of now, LLM's reinvent the wheel constantly whereas libraries are thoroughly tested and can be relied on. Libraries like BLAS and LAPACK get things right down to points of precision and roundoff.
And, if the LLM's are programmed to incorporate them, then the LLM is a bit more than "glue". More so than programmers, scripters like me (I did mostly sysadmin work) are even lazier, and call on libraries.
You can do that with a quality programming language like python, perl, java, ruby and so on, and get (mostly) dependable results.
And languages have interpreted versions, if not already interpreted. Java has groovy and so on, so development is more of the rapid prototyping variety than waiting for compile.
Just take a look at Jupyter Notebooks. "Batteries Included" tons of batteries, (libraries), all tested and reliable and with a nice GUI interface. I got a free version (carnets) for iPad.
I would seriously invest in a language with rich libraries to leverage than to ask an LLM to reinvent everything on the fly. You can't even test them, since they are mostly black boxes.