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When Jira Cloud was launched custom conditions and validators didn’t even exist. This is because they completely break the design of the cloud architecture. Performing an action in the cloud sets off a chain reaction of micro-services and events all at once, like knocking over multiple rows of dominos. Conditions and validators require a pause in those events while they determine if the domino should fall over or if it is allowed to fall over. It really doesn't work like that so instead of being able to use scripted conditions and validators Atlassian release the expressions language which is the only available way to create custom conditions and validators.

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