@crazycells this is an interesting concept, and I’ve been looking at this same technology for a while now. However, I do think it has flaws in the sense that you can use multiple devices, and if one of those were stolen, that could then easily act as a gateway to gain access to your accounts via an unauthorized source.
Admittedly, you could easily prevent access by disabling that specific device, but the window of opportunity would still exist for a short period of time, and that may be long enough for any nefarious actor to compromise your accounts.
No technology is going to be absolutely perfect, and we have to accept that. However, I do think it’s going to be a while before this new method of authentication becomes mainstream.