I get it, the idea is that you find guardians who are experienced and know what they are doing. Only issue there is, that isn't what a guardian rank is. No matter how skilled or otherwise you might be at the game there is no getting past guardian rank 6 as a free to play player.
Even if you buy the annual expansion, rank 7 still requires buying the dungeon key and the seasons. I for one am not prepared to spend +$60 to get into LFGs of people who don't understand why guardian ranks are pay to progress. I admit that the later guardian ranks are skill based but they require owning all the content in the game which is just so much money and excludes much of the player base based on money, not skill.
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If the person making the group wants to use the filter, let them. Who cares. If I want you to have 12 toes, 3 arms, and a second head in order to join my group, then that's up to me to sit there with my empty fireteam. Guardian Ranks aren't pay to progress. They are pay to ACCESS past level 6. There is nothing you can buy in this game that will increase your Guardian Rank so calling them pay to progress is just incorrect.