One of the challenges in this space is similar to captive portal detection. It’s not enough to have a solution, you need the vendors of those devices to adopt the solution.

Unfortunately, just like captive portals want to avoid detection by your OS [*], the vendors of these devices want to do the least possible work, for the lowest possible cost, never updating or supporting the device once sold. Any new solution is more work for them, especially early on when things are still in development/in flux and may require changes over time, since the problems in this space are actually rather difficult.

It’s not that this problem isn’t important, but rather that there’s no clear good path here. However, even still, the alternative (of HTTP) is much worse for the Web, so TLS is still promoted aggressively.

[1] The reason captive portals want to avoid OS detection is because the OS-spawned UI generally doesn’t have access to your browser cookies. The ecosystem has mostly ossified around a few captive portal vendors, who want your cookies either for advertising/demographics/traffic, or want to offer “Sign in with Social Network” (to both track and... advertising). So they want you to use your main browser, not the OS UI, and thus want to actively avoid OS detection. It’s sad.