My issue with the JS world is that it is leaking from frontend webdev into other domains. 0.1% of your users having a bad user experience because of using a "just good enough" JS library is pretty fine for me, even if I am - as a user - in that 0.1%. But taking down your whole k8s cluster thanks to switching to a "just good enough" JS library from a battle tested python library is the exact opposite of "fine".