Do you use flexbox grid in your projects?

Question

css

If so, can you show an example of your work?
If you don't use it because you need support for ie < 10, then why not use a combination of flexbox grid + flexibility ?
If the problem isn't support for ie < 10, then what's stopping you from switching to flexbox?
If you switch from a regular grid (foundation 6) to the flexbox grid that they provide and add flexibility as a safety net, would this transition be equivalent?

Answer 1

why not use a combination of flexbox grid + flexibility?

And for this, I would beat off my hands. It is categorically impossible to tie a layout to JS. It's slow, it's important, it's... it's slow!
If a person is sitting on an old IE (a very slow browser in itself), then with a high degree of probability he also has a weak computer. Further, they most likely do not have adblockers installed - this is still a bunch of brakes. Well, if for some reason you decided that you need these users - why mock them?
Here, on a powerful PC with the latest browser, sometimes you get annoyed because some kind of sticky panel lags ... And if the entire layout is rendered by JS in IE, this is a hanger.
I remember when CSS3 (rounds, shadows, gradients...) was just released and of course IE didn't support it. Pretty quickly, the community spawned a truckload of polyfills for this cause. There were small ones, for one function, and there were whole packages.
So: they normally worked only in demos and simple cases. It was impossible to use in real complex sites - everything was wildly slow, and buggy. You can't overload IE with things it's not designed for.
Degradation should be gracefull, not lazy.

Answer 2

caniuse.com/#search=flex
As you can see, it's not just about IE, although as for me, let those who use it burn in hell.