The answer is the classic desktop model, local first than "connected" (these days we would use more the synced term instead). Meaning some do NOT want people own their digital infra and know the power it give for business reasons, meaning big money. While most to not even know what they can do with their own "endpoints" or modern dumb terminals that actually do have much more power than old dumb terminals and they cost much as well.
The answer is "hey users did you know that you can have GMail on your iron? All you need is to pull messages from a server to your local maildirs and run a local indexer with the relevant UI. If you do that perhaps with a personal domain you can change the provider or be yourself the provider without change NOTHING nor the UI nor the addresses/aliases. YOU WON YOUR DAMN DATA". Or as well "hey, did you know you can damn work with some files locally than have them auto-sync-ed back to the server? It's easy. And so on.
The answer is that we need damn desktops also in hw, meaning not using craptops as desktop replacer no matter if docked with a decent screen(s) and input devices or masochistically used directly on their small bad keyboards and small screens. We need the concept of home-office and tools to be on-the-go ONLY when we need them, we need the concept of a damn homeserver per home, to host personal services in an IPv6 internet with a static global per device (allowing privacy extensions, but still knowing a static address if needed) and so on.
Unfortunately most people do not care until they discover they are trapped and that's too late because they use walled gardens and there is not much modern sw to work in the classic way while few profit from the most and to their best to avoid such knowledge.