[rckt]

I use flexbox for grid purposes, simply because the syntax is straightforward and easy to read. Yeah, it’s one dimension, but if you nest it, it becomes two with no issues.

[laszlokorte]

With nested flexbox the nested dimensions are not aligned to each other. With grid the items are aligned across both each row AND each column. With subgrid even nested grids can be aligned across nesting levels.

[rckt]

True. But so far I haven't faced layouts that I could not implement using flexbox.