DISCLAIMER..... JMO on breeding mixes not the dogs themselves.
Different breeds were created for a job. Jobs that many no longer be needed. There really isn't a need to create new breeds now.
To cross a Yorkie with a Poodle for non/low shedding is silly. Just breed a Yorkie with the correct coat and wa-la. You don't need a cross of lab and poodle for non shedding hunting/retrieving dog the standard poodle can hunt and retrieve.
These aren't really breeds either, they are crosses. A breed isn't a breed until it can be bred back for generations and reproduce like with like.
If someone really breeds a cross and creates a new breed over time I don't have a problem with that.
I do have a problem with a breeder who breeds 2 different breeds and markets them as something better, healthier and something more than they are.
Then they tack a fancy name on it and charge a fortune.
Usually with no health checks, guarantee, or worry of temperament problems that can arise from the different breed qualities they have blended.