> In what way is being on Vue 2 painful? Using it in production, zero problems, everyone understands it, does everything we need.

I think others have offered sufficient/agreeable takes on this, but as the OP, I'll firstly point the pain finger at our own development and blame far too much state/ui/biz logic existing in the web in very tangled and inappropriate ways (part of the nightmare I inherited). Beyond that, the actual vue2-related pain points are typically ecosystem-related support (packages, etc.), and specifically being able to adapt to typescript (this project was initially done in early vue 2.x with just javascript, and attempting to reimplement in typescript to address some of our pain was not fun)