I currently use a FP3 which has 4 out of the 6 features above, which I feel is the best we'll get right now.
Admittedly the Heart rate monitor is more of a gimmick nowadays, especially that it's standard and automatic on most smartwatches and sports watches. Back then when stuff like the Sony Ericsson LiveView and LG W100 watches were popular, they did not have heart rate sensing built in
IR blaster was the shit. Back then, there was an app called beep and go (I think) that held the barcodes for your loyalty cards. For someone that collected them like baseball cards, it was really handy.
Anyway, Samsung actually had the ability to transmit the barcode via the IR blaster which some scanners could read if they couldn't read the barcode on the phone.
It was awesome!
I agree that the heart rate monitor was a bit of a gimmick though.
And then they completely bork the file system with separate storage for every app. Nobody needs a dozen different folders for storing pictures, with no way to combine them.
IR blaster! I miss that feature. When my wife was sick in the hospital they had a TV with 10 stupid channels. But I found that the TV had a USB post. So I used a flash drive and my phone as the remote to let her watch TV shows while she was stuck in bed.