This comment makes less sense if you are familiar with CSS. Web developers don't have to guess 300 times to make UI adjustments, despite having no direct editor. If this was a problem you should have programmed in better layout primitives.
Dev tools in the browser are a direct editor, sure you can't drag things around with the mouse, but you can edit values live and see them change. Big difference from recompiling to see changes.
You can but good CSS devs don't have to. They know pretty accurately what it will look like in code