That’s one part of it, but the other is that there’s no proper way to ensure you won’t cause issues down the line and it makes the configuration unclean and harder to maintain.

It also makes your setup dependent on seemingly unrelated things. Like the certificate for the domain which is some completely different applications problem but will break your Home Assistant setup all the same. That dependency issue can be a nightmare to troubleshoot in some instances, especially when it comes to stuff like authentication. Try doing SSO towards two different applications running on different subpaths on the same domain…