I Want Shifters Who Shift

The Arranged Omega: MM Gay Shifter Mpreg Romance - M.H. Silver

This was supposed to be 'brain bleach' for me. I guess I'm trying to understand what readers like and don't like about Mpreg stories. This is my third one and I don't care one way or the other as long as the story is good. Bailey is an omega wolf shifter who is being forced into marriage to a creep. He meets Leon who's looking for a fake mate.  That's really all there is to it. My big issue is, why make the characters shifters if there's so little shifting? Heck, I didn't even think they could shift until three-quarters in and that was just a peek. I craved more sense of place and answers about the magic makers and what about the humans? Were there packs in any way shape or form? Or was it all family? Most importantly why are omegas treated like broodmares, second class if that?