I think that's a mischaracterization. Given two identical experiences, one that locked you in and one that didn't, I'd imagine most people (though sadly not all) would choose the more open one.
The locked in experience here is simply substantially more seamless and out-of-the-box ready than the open alternative. Given that the point of a handover system is to make using multiple devices seamless, it's obvious that being "more seamless" is an advantage.
I setup a Chromecast for my mother who doesn't have cable or anything at home, and it took several explanations spread out over a year before she finally started using it on her own, but now she's using it daily. Any harder to use and it wouldn't have been helpful at all.
She's not exactly a luddite either, this is actually the first thing I've tried to teach her that she's struggled so hard with. Hopefully it's not a sign of aging...