This is my take too. Bootstrap and foundation's float hack grid systems kept us alive while CSS caught up to "OMG we need to display websites on mobile devices"

This is my take too. Bootstrap and foundation's float hack grid systems kept us alive while CSS caught up to "OMG we need to display websites on mobile devices" Then grid and flexbox came along and gave us a native css solution. Then everyone moved on to figuring out SPAs - or as I call them "OMG we need to display websites on mobile devices 2.0"