They need more time to finish the app versions of new content like events. I would like Inno to release events to PC and app at the same time. If PC version is ready one week or 2 weeks earlier than mobile app version, why not hold the start of the event on PC until mobile app version is ready and then relelase the event to all players at the same time? sounds more fair in my opinion.
The above is specially for Live Servers, in BETA I'm not bothered if event is released earlier for PC vs Mobile App. Early feedback in BETA for PC version may or may not help mobile app version still in development.