When I got my Vision+ I purchased 4 batteries total. The two that came included with the bird I just used with reckless abandon. Flew them down to 10% (sometimes less) all the time. Packs 3 & 4 I did the "baby 'em for 10 cycles" routine. Two years later packs 1 & 2 are going strong & I still use them with my Vision+. Packs 3 & 4, the babied packs, have both failed & cannot be trusted to fly. I had to replace both packs.
The infamous pack #3 caused my Vision+ to go down twice. Once in an inexplicable decent into the treetops when it was only a few months old, & more recently when I was forced to make an emergency landing on a remote island after only 5 minutes of flight on a full pack. It was fortunate I was near this island or the Vision+ would have been lost in the Bay. Pack #4 was responsible for an unexpected auto-landing 1500' from home on an autonomous mission when the battery auto-landed after only 14 minutes of flight (normally I get 18-20 for P2 batteries & pack 4 actually flew earlier the same day for 20 minutes). There was no benefit from babying & both of these packs are now marked "Do Not Fly!"
DJI warrants their batteries for six months. Further, the batteries include Smart technology. If theories like "only discharge a battery to 50% for the first 10 cycles" or "don't discharge batteries below 30%" were important to the life of the packs, then DJI could have implemented this automatically like they do with auto-discharging the batteries down to 60-65% every 10 days.