I'm not a Flexbox expert, but I'm curious to learn what Spectre has over Bootstrap in this domain. Is it the .hide- classes? Is it the Responsive Resizer testin

I'm not a Flexbox expert, but I'm curious to learn what Spectre has over Bootstrap in this domain. Is it the .hide- classes? Is it the Responsive Resizer testing tool? It seems that the .col-[size]-[num] classes function exactly the same way in both.