If you were to check the timestamp of this thread when you bumped it you would notice that it’s 10 months old, and is very out-dated.
The main issue with the way components are loaded in the repo from this thread is that it bundles all views together into a single bundle. Extensions are a multi-page app and should be treated as such in the build process, rather than creating a singular bundle for all views.
TwitchDev has released their own extension boilerplate built on React, you may want to check that out instead: https://github.com/twitchdev/extensions-boilerplate