I call out for a3+ for big 4 dungeons but usually I won't kick ppl with raven gears join in my lobby. I don't mind because I run with clan and we have 4 end game gear players in party. But what always happens is player with low gear have absolute no idea of mech, causing countless boss jumps in RT, pulling curse/ spawn on TS etc. It's not like high end players don't want carry newbies, is ppl get tired with new players don't read mech and DOESN'T LISTEN, eg. wl don't do sb, random sheath... (╬｀⌒´)
If you don't have gear to carry the whole party, or not sure if members know what to do, the only way is asking for high AP requirements.