Can anyone please enlighten me on how the new Flexbox layout model is any better than current tables way? (display:table and all those are includedin my
The Flexbox model is more powerful than display table. Flexbox supports layouts for right to left languages for example. And yes indeed, flexbox is a bit complex and that's an entry barrier. Float and clearfix layouts are a (clever) hack, somehow in the same way table layouts are a hack, flexbox is meant for layout.
The browser support is getting better lately, some say we should use it now. Bootstrap 3 does however not make use of flexbox, but i can imagine that the next version will.