It is very frustrating to pounding your keyboard and your skill does not trigger. It is absolutely worse in Cyrodiil, but still happens PvE zones.
Is this server hardware issues? Does ZOS have to scale up in their hardware structure?
Is this software issues? Is it just a poor underlying software programing? Does ZOS have to migrate to more robust software platform?
Is this network issues? Yes, lagging amplify this problem.
All these performance enhancements implemented over past year seems to make no difference. If anything, it is getting worse.