There are huge swaths of the world where this isn't true. Short of making computing devices and internet connectivity human rights, these assumptions compound existing inequalities.
First is a one-time hardware private key, with physical protection of it (i.e. you need to break the device psychically to extract bitcoins), and ability to verify address by plugin-in into USB.
Second is a USB power from 9-volt battery. So you can check that the OpenDime is active.
The only hard part is verifying the balance you need an access to blockchain network. Not necessary to do that through internet, because you can receive it though satellite now [3], but you still need a computer, that's the fact.
1. https://opendime.com/ 2. https://usbcoldpower.com/ 3. https://blockstream.com/satellite/
Connectivity and devices are not that big of a leap forward from there and seeing how hungry western and Asian businesses are to open new markets in underserved areas, it’s unlikely lack of connectivity itself will further inequalities. Not for long anyways.
The need for powerful computing gear could, maybe, if there is any advantage to being part of the mining network...