[silvestrov]

Flex and grid are 2 different domains.

Grid is good for making grids.

Flex is good for creating flows of content, like a <div> where all childs has display:inline-block. It supports wrapping when content can't be on a single line.

[meerita]

Exactly. But we came from using Flex as the defacto system to do layouts and more, now with CSS-Grid it does make sense to use flex for what it was meant for.

[Macha]

I guess it depends on your past experience, but for most of the teams I've been involved in, it was basically a leap from floats to grids for page layout, with flexbox being a small scale option before and after.

[nightski]

Anyone that had to support IE11 probably avoided grid for a long time but could still use flex.

[meerita]

Yes. The more older the project is usually goes with the avoidance of CSS-grid and other features.