Why isn't there a bitcoin device separable from phones and laptops, it would be something like Trezor & Ledger Nano S but as a stand alone device. This would be a great invention where you can load bitcoins on it and use it to buy things. It would be used for spending instead of storing like the hardware wallets.
You only need to connect it to the internet, and can only send or receive coins. No emails, browsing, or apps, so it's harder to hack into.
Or is there?
The reason why I like bitcoin is because it is accessible from almost any device without the hassle of carrying it in my pocket and lose it somewhere due to carelessness. I like your idea though, but I cannot imagine what would happen to your hard earned bitcoins once you have misplaced your hardware and you weren't able to recover the seed because it is stand alone. I guess transacting bitcoins via tether is a more practical invention rather than creating a stand alone hardware. If only there is an option for us to transfer BTCs offline, and then will just have to sync it once you are connected to the internet, that will be very useful.