I think it would be great if DCS added a maintenance or reliability system for SAM launchers and sites. For example, a poorly maintained system could have a chance for its missile to go off course, fail to detonate, or suffer from a miscalibrated INS. Things like that would make air defenses feel more dynamic, realistic, and engaging instead of always performing perfectly. It would also be nice if this feature could be configured in the Mission Editor, so mission creators could set how reliable each SAM site is. Having support for this in the DCS Scripting API would make it even better, allowing us to understand how it works and expand on it through scripts. This kind of system would add more depth and variety to missions, make air defense engagements feel more authentic, and even introduce a bit of a storytelling aspect.
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