The Symfony Finland site has a new post with a brief look at how the adoption rate of Symfony Flex has picked up with the impending release of Symfony 4 coming next month (November 2017).
With Symfony 4.0 a new standard structure for building applications is being adopted. This is known as Symfony Flex and will be the preferred way of creating applications. Symfony 4.0 is scheduled for release in November 2017, but many projects have already started adopting the new structure.
[...] In six years a lot of things have changed in the web development world, with the rise of front end driven applications, containerised microservices and more. [...] One thing that has not changed for some time is the Standard Edition itself. It has been critiqued for being enterprisey and heavy on configuration. [...] The trend was noticed by the team and in December 2016 at the SymfonyCon Berlin Symfony Flex was announced.
The post also lists out some of the projects that are already embracing Symfony Flex in their project structure including the GraphQL bundle and the PhpStorm Symfony plugin. Symfony Flex also gives developers a way to more immediately work with Symfony 4 when it is released through the same methods as now (with the 3.3 components).