Community or rather i'd say pickup groups doesn't want melee in most contents because most melees are known to be pretty damn stupid. They do not have any idea how to keep themselves alive, expect heals/esuna without bringing their own meds, wear full AF, alot of melee main DPSer are just infamous.

I seriously have no doubt, people that are whining are actually terrible players because like what Ruri Temari said, he played melee class few times, showed people how good he is, and he have no issue. If you are not terrible, people will not mind whichever class/jobs you goes.