It seems that way ... not quite ready for prime time, but hey, like SNL it's great in its own way. It's fun for early adopters willing to accept some early kinks or those expecting more of a Bluetooth Boombox with benefits. That said, the launch seems to have enough gaps to frustrate those hoping for something more polished and gig-proof.
Glad you found the right gear in the Mustang III. I've been very happy with my Fender products (circa early and mid 90s).
I'll likely keep the 75 as a way to contribute to the tone community. If the experiment fails and that Line 6 drops support, so be it. If it succeeds, hopefully, those tones can be migrated to an Amplifi HD (or whatever marketing decides to call it... hopefully, something more searchable).