a few reboots ~ easy to use cold storage
In my experience, those requirements don't work well together. I've spent a lot of time creating and signing a transaction offline, and ran into several problems (wrong version of Electrum and later a fee of less than 1 sat/byte). It took a while to get it all right, and considering how little I do this, I already forgot which Live CD eventually worked.
I do have spare netbooks though, but they're old (1GB) and slow, and I never set them up for offline usage.
But some do prefer the convenience of HW, some do prefer to use it together with their smartphone, ... and this kind of setup may be OK for them.
I'm not very fond of hardware wallets either, but it does the job and is a lot more n00b friendly (until they enter their seed words on a phishing site).
And those devices can have their own "hidden" internet only if they get connected through wires (which you should clearly not do) or you enter there your WiFi password (which would be even more stupid to do).
Until they come with their own data connection. Prepaid data isn't that expensive anymore, and could be worth it in a targeted attack. People have already been sent
fake hardware wallets by post.