Gather requirements -> Small focused spec -> code -> Validate -> Fix/Adjust -> Remove spec once it is captured in code and tests.
Agile is stronger than ever, spending time on every small detail in a waterfall approach makes you burn human time on work that most probably could have been perfectly fine with a default approach.
Context matter but I fail to see people spending months on planning out a system before building anything.
Almost nobody works on medical devices... And some of you lucky folks might be working with mega minds everyday, but the rest of us are but shadows and dust. I trust 5.4 or 4.6 more than most developers. Through applying specific pressure using tests and prompts I force it to built better code for my silly hobby game than I ever saw in real production software. Before those models I was still on the other side of the line but the writing is on the wall.
Agile is stronger than ever, spending time on every small detail in a waterfall approach makes you burn human time on work that most probably could have been perfectly fine with a default approach.
Context matter but I fail to see people spending months on planning out a system before building anything.