I'm all for it.
One important thing is working it into the lore. Because we all still play as Guardians at all times.
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It would be easy "FWC created a virtual game mode where guardians could experience enemy tactics against each other. Leading them to a better understanding of how to combat such attacks while on their journeys" or something. (I said FWC because of the arachnid helmet possibly being the device that made people go crazy in the grimore cards)