Not to me. The Poly is a fairly new product. It would be stupid to come out with a new Mojo that does't work with it. At least with this new Mojo 2, it appears to get the best of both since it also has USB-C.
Yes, if I invested twice the costs of a Mojo1 into a Poly; I would be upset if I could not use Poly with a Mojo2.