We do have apps that take the accelerometer and report it. So I can view individual aircraft and what they reported. I can set it to automatically report so others can see. We have so many tools that its almost decision paralysis due to too much data. If you see flights reporting turbulence from 26-38000 and atc says some flights reported mtn wave. its tough not to call up the FA's and be like "it might get rough maybe take a seat" however 50% of the time you end up missing it or just hitting a little chop. Its a lose lose. I did a turn last week rocked down to CHS smooth on the way back 35 min later. One leg i get compliments "thanks for getting us here safely" the next complaints about making stuff up.

The other day coming into JFK routed through a line of rain and heard constant .....ing about the ride into NYC. Short flight basically up to 27k cruise for 10 min then back down. Told the FAs to just be seated the whole flight. Welp it was the smoothest line of rain i've ever flown through and the turbulence in the descent didn't materialize, right before our descent atc said rides getting better maybe a bit of light chop. So I ended up looking like an idiot. I'd rather land in a 30kt crosswind than make a decision on FA service at least one of those I can get 100% right lol.

I will say in my 12 years of flying i've never had one FA ask me to make up a PA about canceling/reduced service. I don't fly for delta but in my experience their FA's are slightly better than ours so I imagine its the same over there.