I'm stoked about the Librem 5 project, and I hope it succeeds enough to not disappear in a couple years. I just bought a phone, but I'll likely buy the next rev if the first one works out. I don't need much from my phone, and as long as I can make/receive calls/texts, browse the web, and can get consistent security patches from the community (e.g. some Linux distro supports the platform outside of Purism), I'm happy.
Android and iOS already support privacy controls (and root to an extent), but you're usually at the mercy of the manufacturer for updates and have to trust them to not remotely access your phone. And many manufacturers just stop sending updates once their new model is out, which is unacceptable for most people for laptops and desktops, so I don't know why it's tolerated on phones and tablets...