Interesting how it was possible to get under 5k diamonds a 2nd grand building during St. Patrick’s day. It’s also very good possible to get multiple grand buildings for free. My point isn’t that you get every single event multiple grand prizes for free. The point is that with diamond farming it’s possible to get multiples once a good grand prize shows up.5,200 monthly diamonds isn't even close to getting you everything for free. That's maybe 1 Grand Prize building in 5 months. You need 83,600 Diamonds for Expansions, so that alone would still take 16 months. That's not an unreasonable time-frame
If Diamonds in Guild Expedition were an issue, it would have more to do with some servers having 20-30 worlds, not 6
In that case, would anyone buy extra diamonds if they could get it free anyways? Most often it’ll be no. Which is the point why it’s compromising revenue of the game and ultimately threatens its longevity. On top of that, it’s often not just GE that gets farmed. The 5.200 diamonds example from GE is kinda low estimate. Cause it doesn’t take farming GbF out and WW/FoY farms. Tricky to set up but harmful for the game’s longevity.
To cut it short. Farming diamonds at the scale it happens compromises potential revenue and to an extent the longevity of the game. That’s why this change is good imo.