Disagree. When tool limitations meant that this was the way people had to work, many people could do this.

It was much more inefficient, because it's easier to find bugs after compiling or running the code. But it is perfectly possible.

Even more extreme than that, if you were working on a large code base where compiling it took forever, or you needed to rely on a very slow CI pipeline, it became very important to git gud and write shit that worked first time in order to deliver when promised. I'd argue if you've never had one of those moments where you sunk a bunch of time into some changes and it all compiled/worked flawlessly the first time, you're missing out.