It's probably not surprising that a group of tech people tends more towards introversion and exercising alone, whereas the general population likes the group aspect for motivation.
Hydrow goes for the more immersive experience--haven't used one; don't know if it has any third-party support or not.
Most stuff I use for cycling speak ANT+, so it can be combined as one wants. My indoor trainer, my cadance sensor, power meter, speed sensor, HR monitor, watch, head unit, phone, computer all can send or receive through ANT+. That's why you will find most cyclists oppose the Peloton bikes, they are impossible to combine with existing gear.
And that's why this exists! (Though it's BLE, not ANT+.)
Yes, pre-pandemic, there were other people in the room where they recorded the classes. And likely there are other people taking the same class as you, right now. You can see where they're at on the leaderboard. But they're also irrelevant to you. You can just ignore it. You take the class any time you want, and there's one instructor, and the fact that someone in south america happens to be watching the same stream as you isn't really relevant to your experience.
I'd say in the Zwift world, where you race other people on-screen is more of a "group" experience, but again, both of these workouts are highly individual.
I, and most consumers that've been repeatedly burned, go out of our way to avoid products that lock us to them. I'm in the market for an exercise bike, but a lifetime of $35+/mo for classes, in addition to a $2k+ bike with questionable repairability in 1,2,5,10 years, is not something I'll ever want.