Since I use temp control it's nice to be able to see the watts used for each puff. I have things set up so when the well of my rda is empty and the wick is becoming less saturated I can see the watts declining and temp rising. It's also nice that the puff counter and timer can be reset.
I got used to having one field display the Last Temp, so it's nice to have that on the JTs.
Even at the best of times, TC can get wonky and it helps me to see the temp either staying far too low or shooting 80F high. Usually needs the atty re-seated, but I haven't tracked down a consistent cause.
I usually don't bother.
Just Shenzen things.