Fly has a nice DX but unfortunately the platform still has major issues with reliability and networking. There are often problems with deploys leading to stuck and unreachable instances or other networking issues. It's probably exacerbated by the new user growth but the slick deploy workflow can't override having an app that works.
Render and others are interesting but K8S is still fundamentally better considering all the DX progress there making it pretty easy to get a container running in a cluster.
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