GP 3.0: What was the motivation not to use Grid layouts along with flex?

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While I was reading through some documentation on flex, trying to catch up on it, I came across the CSS grid layout.

I haven’t really been reading up on the debate on Grid vs Flex, but I’ve found it’s out there, and there are some people who propose the use of Grid and Flex together, like in this tutorial for example.

So I’ve been looking through some of the CSS of GP 3.0 and I also read about GP 3.0 having flexbox grids but I didn’t notice CSS grid.

So I was wondering what motivated to not include CSS grid, while grid is almost as much supported as flex, and grid gap. and other features are widely supported these days.