I did the vue2 - vue3 upgrade, while I see what you're saying and actually agree, I have no idea why you had change your build tool from webpack to Vite. I'm still on webpack, for better or worse.
Webpack wasn’t on the list of supported build systems when I made the upgrade, don’t know if it still isn’t there. I preferred to waste time making a supported build system work than wasting it making an unsupported one work.