I don't think this is android specific, but having the IR LED that allowed you to use your phone as a universal remote. I get that lots of TVs are getting fancier remotes that communicate in other ways, but there are still plenty of applications of the IR LED.
Home screen widgets are basically the same thing. The issue with these is NFC doesn't work unless the phone is unlocked, or you rooted it to allow NFC all the time.
Plus, honestly, there's not as much benefit as there used to be. I used to root so I could install that app that red-tinted the display. That's been built into stock Android for a while now. I also liked making the navigation buttons smaller and trying different gesture systems, but imo stock Android gestures leave everything else I tried in the dust. Theming? I only ever used OLED themes, and most Android phones and applications have an option for that now. One by one over the last few years almost every justification I had for rooting was rendered moot. Then Android phones started doing that a/b partition thing and it was just too much of a pita for not much benefit
That's kinda clever, and I'm pretty sure you could still make those work with something like NFC Tools / NFC Tasks. Now I'm wondering if there's a cheapo clone of it on Aliexpress or something.,
The app shows as unsupported on the Play store?
Sadly Google recently updated their minimum target requirement API version, forcing an update. Migration to a newer API version broke too many things, not practical to fix given the very limited amount of stock left. Please download the app .apk here. Please note that you may need to enable app installation from unknown sources. Alternatively you can use any of the many NFC tag automation apps on the play store.
Also answered my other big question
Will it work with my case?
DIMPLE can be attached directly to your case instead of to the surface of your device. Unless the case is made out of metal, you should be fine.
I figured it would since I've never had a problem with NFC payment but it's nice to have reassurance. Now I want to see what exists in 2024 for the novelty. I'm not sure what I'd use it for. Maybe a Shazam button.
There was also a similar product that made your headphone jack a button. Nonetheless, I don't really think phones need more physical buttons these days.