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This is about methods to get loots.
Boss farming: You camp, or know timer to kill them over and over. This way people will have to fight for it which is plainly stupid, IMO. This is probably why they set up instanced dungeons.
To solve this: Boss don't drop best loot, only quest item or what not.
No Boss in dungeon: Every mob has fair chance to drop any loots. Which allow you party up with other people and go your way in dungeon to kill and earn exp at the same time. Don't have to worry about someone camp your stuff or steal your loot that you need.
Raids: Well this has pro and cons and depends on what reward.
Like for an example, getting best loot out of raids then it will make other content empty, aka ghost town Because, then they want to go for best stuff cuz other area is waste of time. Also trying to find members for raid can take allot of time and can be hassle.
Other kind of raids is going on hard quest to complete quest for good reward or to obtain items to proceed your main storyline. But doesn't drop best loot which will keep other content alive as well.
I'm sure there is more but of course this is open to discussion. You decide.