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Clash the DK: I'm sorry, but its a really bad idea. It puts people doing various content at a disadvantage. I don't want to gather even 2 different sets for 1 spec on main and alt. The beauty of current gearing system is that you can get loot frmo everywhere and it can be useful. Check the raid loot tables. There's about 1-3 items that drop from every boss. Some slots are only represented by 1 item in the whole raid, and it can have crappy stats for your spec. Without trading you can end up with 1-2 items per raid clear, which can have the less desired stats. Weekly vault and dungeon loot table offer great compensation for that system. Obviously the way things are right now exist because we have M+ as a gearing option. And previously there was a lot more variety in raid gear. But I like the current system much better as it makes dungeons worth running. And I never felt forced to run PvP for easier ilvl or good gear (the pvp trinket is considered bis for my class), and I never did run it.
The easier solution for the non-group players (apart from looking for other games to play since this is not a single-player game) is to give stronger set bonuses for outdoor content or just the Maw but keep ilvl around normal raid or even LFR. Lower the item acquisition rate to stretch the time taken to get the full set so that there is a sense of progression. If you are so eager to collect several sets - have Maw vendor sell gear with Torghast gear with a set bonus that helps bridge the ilvl gap and let you do higher levels without raid gear. Make that set cost the regular maw currency. This solution gives casuals gear progression that helps them become stronger in the content that they do without interfering with the end-game crowd and making their earned gear less valuable. In the open world a person with mythic raid gear and a solo player will be roughly at equal power level pve-wise (the set bonus should not be active during pvp in warmode shards), but inside raid or dungeon, high end players will be much stronger as they are now. Plus this change will only touch the solo players, who actually are the ones demanding changes, while raiders, pvpers and m+ players can keep gearing as they are.