I have tried given a simple test suite and asking for an implementation that fulfills it, then asking to modify its impl and the test suite with a new requirement and it did it
it's really useful if you work on projects that need different version of dependencies, as you can define on a folder basis what jdk or python versions you want to have. You can even commit this to git so that everyone has the same env locally
I think it's more about the level of interactivity that is "needed". The seller part of the platform would do a lot of customization and changing settings, some of those probably have live previews as well, whereas the seller part of the platform is pretty static, no need for the same level of interactivity, so doing it by manually manipulating the DOM is manageable.
it's mostly lots of code fragments and incrementally building on whatever he's trying to convey, is not like he put a brain dump or a wall of text as per when that phrase is used.
So your comment doesn't ring true in this case imo