I see a lot of issues with updating that could lead to a crash that DJI may or may not honor, we are at they're mercy. I bought my P3S new, my P34K and P3 Pro used the Pro only has 6 total flights when I bought it. its flying great and I'm not touching it as long as it is. I learned my lesson with the P34K that updates lead to issues. I did update My P3S after much research to make sure no issues were found and so far that one has done well. I even disabled the go app updates and I don't turn on WIFI on my display devices when I'm at home just to be sure nothing gets updated. The Issue I had with the P34K was that I bought a new Tablet to run the drone on I paid a lot of money for the Tablet so I had great no lag flights. once I installed the update for that unit the tablet became so lagged I couldn't fly at all. I wasn't about to buy another tablet to fly that bird so I swapped back to the old firmware that I knew worked well I have a ton of flights on the P34K and its now become my spare to the Pro.
The P3S seems to have over-come any past deficiencies and as such, DJI has moved on to bigger and better things.
I am considering a second Phantom (P3SE) as a "back-up" in case I lose mine. The problem is Mrs. 360 may notice the decals are a different color and I'm busted! Pretty sure I may be able to swap those out, though.