Hi Lester,
The XY Grid was built particularly with production in mind - it was inspired by CSS Grid but built using Flexbox to give browser support back to IE10. I certainly hope you don't have to support any further back than that... but if you do, you can still fall back to the float-based grid instead of the XY Grid. That option will remain throughout the Foundation 6 series, though with 7 we will officially drop support for IE9.