Thanks for the write up.
I actually think that the Pantsyr actually has a pretty good ammunition capacity. For comparison the British Marksman (SPAAG only) carries 400 35mm rounds. The Avenger carries 8 Stingers (much shorter range)and a modified M2 with The more famous Gepard only carries 320 rounds, and there’s been talk of adding short range SAMs too. Now, the 35mm is probably more effective (the Russians went to 30mm because it was better than 23mm), but I wouldn’t call the Pantsyr lightly loaded for its job.
It’s kind of hard to compare with western systems given that I think most western countries have adopted the U.S. doctrine of air superiority through the air force—see the Avenger which I see as only being effective against helos.
Oh well, I was incoherent above, but I’m hoping people can piece it together.