I have mixed feelings about dog breeds. They are selectivly bred for a specific set of features for a use-case, if that use-case is gone, is there a purpose for

I have mixed feelings about dog breeds. They are selectivly bred for a specific set of features for a use-case, if that use-case is gone, is there a purpose for the breed? Other than a companion or to look pretty? Should we feel bad if they go away? I always owned mutts because that is what all shelters have. And they offer the same amount of love if not more. I didn't pay a cent apart from a donation and I don't have to fear any specific heridetary problem (which is a good and bad thing because I cannot predict health issues).