Easy version upgrades
Is my application compatible with that sweet new PHP 7.4?
Let's find out!
Create a new environment; code and all!
You can clone the whole project using Git,
or the Platform.sh CLI.
Clone the project, edit one character. And git push.
The entire environment is rebuilt, now on your new version.
Do whatever testing you need, automated or manual.
Production hasn't been touched.
You know it works. You've tested it.
Deploy the exact same configuration to prod in seconds.
Most services can be trivially upgraded, too.
It works for any change, any language, any dependency.