Me, personally? I don't really care about the ego boost of Ehlers' carrying his own line. We don't have a dominant first line that is supplemented by a dominant second line, like Crosby and Malkin. Lacking that, I'd like to maximize the rate of scoring minus the rate of allowing goals against.
I really don't give a lick about which line combinations accomplish that, and I can't for the life of me understand why anyone would. If the first line that maximizes our goal differential in the long run is Chibrikov, Scheifele, and Comrie wearing a tutu, neat.