From the HACS FAQ:
So you didn’t find a workaround, you found something entirely unrelated. There are no addons in HACS.
Perhaps this is the confusion? Addons are entirely separate software that HA users often find useful. Installing and running an addon makes a new docker container and runs that software. HA is unaffected by this.
HACS includes lots of things, chief among them are custom integrations and frontend plugins. Installing these does change HA, it adds something new option to the integration menu or when configuring a dashboard. If that’s what you want you’re in the right place. The addon store is more like a curated version of dockerhub.