Depends a lot on your needs. For my company, we don&#x27;t give a shit about people on old browsers. They make up an incredibly small % of the visitors to our customer&#x27;s sites and we&#x27;ve never once had a client ask for IE9 support or anything like that. We go with the most recent version, and one prior, and that has served us well. Never received a complaint from a client about a customer of theirs not being able to do something on a site.<p>Some people don&#x27;t have that luxury, but for the rest of us Flexbox is ready to be used.