Honestly, I do want a better smartphone. Not better as in more pixels or processing power, but more features.
My P8P has a temperature sensor on it. Every phone I own moving forward is gonna need that now cuz I use it for all kinds of shit basically daily, great tool for a SMART device.
I miss IR blasters, they weren't as useful but they had their place
I miss the short time period where volume and lock buttons were on the backs of phones.
More weird sensors and functionality that might prove useful in niche situations, please.