Encrypting your local traffic is still valuable to protect your systems from any bad actors on your local network (neighbor kid cracks your wifi password, some device on your network decides to start snooping on your local traffic, etc)
Many services require HTTPS with a valid cert to function correctly, eg: Bitwarden. Having a real cert for a real domain is much simpler and easier to maintain than setting up your own CA
Who cares if it’s exposed to the internet?
Encrypting your local traffic is still valuable to protect your systems from any bad actors on your local network (neighbor kid cracks your wifi password, some device on your network decides to start snooping on your local traffic, etc)
Many services require HTTPS with a valid cert to function correctly, eg: Bitwarden. Having a real cert for a real domain is much simpler and easier to maintain than setting up your own CA