Your information is a few years outdated. lineageOS neither comes rooted, nor does it offer a native way to root anymore. Magisk became a thing with a whole community around it. It’s an unlocked bootloader hider, root manager (and hider), and a system patcher, all wrapped up in one tool.
With Magisk, you give root access to the apps that need it, hide root ability from apps that require non-root devices (those apps do that by pretending to need root). Also, the Magisk app can rename itself, which is important as some apps check against the name itself.
The future challenge is with Google trying to force hardware identification (Apple style). I have not been following developments regarding that though, since as others mentioned, my X years old phone is still serving me perfectly, and I have no intention to upgrade any time soon.
In internet years, Torrenting is old. I2P is old. Even torrenting in I2P is old. Nothing about this is “the future”.
Ideally, the future of file sharing would involve a fully/natively integrated anonymous network with content-addressable distributed filesystem.
But this will probably not happen, as that architecture didn’t see large scale success before, except in Japan where at least some elements of this architecture are used in their popular P2P networks.
The I2P crowd themselves tried with Tahoe-LAFS, but that was never really a network, even aMule over I2P had more traction, and by traction I mean tens or hundreds of users, not thousands or beyond.
Ironically, the one content-addressable distributed filesystem that gained some attraction (outside Japan) is IPFS, which doesn’t offer anonymity, or replication, or anything special really. Yet for some reason, some hype-susceptible techies liked it, together with the NFT crowd, a great fit.
The future of file sharing will depend on where most content will land where it will be easily accessible and quickly grabbable. How those networks will look like? Nobody knows.