You can add more columns, of course, e.g. for a sidebar. That's the advantage over flexbox. Grid is great for whole-page-layouts, Flexbox' strength lies more in the smaller scope, like Navs or Lists.
Still would see it as a bit of an overkill for this specific use case and, really, nothing prevents you from using flexbox also in the larger scope of the page.
You can add more columns, of course, e.g. for a sidebar. That's the advantage over flexbox. Grid is great for whole-page-layouts, Flexbox' strength lies more in the smaller scope, like Navs or Lists.
Still would see it as a bit of an overkill for this specific use case and, really, nothing prevents you from using flexbox also in the larger scope of the page.
Of course not. I was not stating that.