Love the GR system especially since most recent update!
Going up in the ranks after GR 6 is a good way to show you have a potent and an ever increasing understanding of a wide variety of content, and because of that I think unlocking difficulty levels of matchmaking as you increase your rank makes sense.
An example of this could be:
GR 7 Unlocks : Legend Matchmaking (Weekly Campaign, Nightfalls, Exotic Missions etc)
GR 8 Unlocks : Master Matchmaking + Dungeon Matchmaking
GR 9 Unlocks : Grandmaster Matchmaking + Raid Matchmaking
One might be confident matchmaking with GR 8 players in a master nightfall for example with the knowledge that all those in the matchmakimg pool had to complete difficult objectives that require similar or matching level of skill.
Thoughts?
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A good idea, working this way should overcome the issue of people not knowing what to do which is often used as an excuse for not have matchmaking on a wider basis.