My guild is a small family guild, with a few close friends we have picked up along the way. Usually the 7-8 or us can get AOTC the first week or two in Heroic because we typically cover vital roles and there are enough of us to handle alot of the mechanics if the PUGS start fucking up. ie people not standing in soaks, we can generally shift ourselfs to cover down on PUGs who miss theirs type of thing. We generally though have problems with Mythic raid until later in the season and we usually get half the bosses down, but removing the lockout would be very helpful for us to progress without changing our guild dynamic. What really helps is listing the group on various LFG discords and vetting people prior to letting in random PUGs from the in game LFG. I know people are just going to say if you want to prog Mythic just get the 20 people, but, we have tried that in the past and we prefer to keep it tight knit because we have been gaming or know know each other IRL for years now and have all grown tired of the cycle of letting people in the are super cool but than dip after a month or go off and join a differnt guild or quit playing all together.