having something that specific, tailored for dynamic language, seems like overkill
i'd undestand if it was for something highly performant and hard to deploy
Maybe, but maybe not. If you're using Python/JavaScript and have a ton of dependencies, most of your deploy-time is gonna be spent downloading dependencies. If the host you're using is specifically setup for Python/JavaScript, they can run a registry mirror with 100% of the packages right next to the host, and remove basically most time spent downloading the packages.
Same goes for other time-consuming activities like code coverage or even running the tests. If the applications running on the platform are somewhat heterogeneous, then you can start doing really aggressive performance work.
Same goes for other time-consuming activities like code coverage or even running the tests. If the applications running on the platform are somewhat heterogeneous, then you can start doing really aggressive performance work.