Simply put the ability to masterwork is the only place enhancement cores should be required. This would solve everything. You should pay to be able to access full game. So master-working is a function of that. Besides Bungie said themselves, friends playing free have access to everything in DLC. Another words why buy and expansions, they are free to all. Including core system.
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You are so wrong. Only the location to free roam will be added as free.