Most of those “classic legends” you mentioned have all some thing in common: they had original voices and singing styles and they had personality. They were instantly recognizable. They stood out. They were able to elevate even mediocre songs. They could deliver ballads with passion and without schmaltz as well as belt out rockers.

LaBlanc and Hilli don’t have any of these abilities.
And why would you mention Dennis Ward, who is an incredible musician, when PC69 featured two way better lead singers?