There is absolutely no incentive to make a guild but to have power and access to loot. Who makes guilds that are actually succesful? Certainly not the guy going "Looking for casuals

". Also why most guild leads (who usually tank as well) end up being absolute dog shit at actually managing a guild: They just want to be Kungen for their era, having little to do with the guild but being the face.
The few succesful guilds I've been in had a generic loud charismatic main tank and someone smart doing the management, planning and recruiting. Except nowadays everyone just wants to be the cool Illidan guy who makes a guild called <Kappa Fourhead> to get all the cool loot. Wipe 3 times in a row and half the guild quits.
I've been around since vanilla and practically only consider raiding if the guild functions without loot being a factor. So, 1 in 50 is eligible. Usually it's just a matter of how long you can deal with "ding xD" types or elitists who're a mix of twitch-chatters and 4chan visitors. I started playing on an RP realm because it was frankly inspiring how alive and engaged people were, not only roleplay-wise. Lo behold the top 3 mythic guilds all had elitist anime shitlords in their raid teams who "ironically" ran around ERPing with each other.
So basically there's a sweetspot between "I want loot" and "I want friends" where you actually enjoy doing content at an average rate without being stuck in normal mode. Outside that, little in Legion to do but getting the artifact skins unlocked for use in the future when they're unobtainable.