Cleric was part of the problem for those kind of healers, but the biggest issue is and was that those players most of the time just aren't confident enough to do dmg. This is an concept many, many "non-healers" can't grasp, especially talking to healers doing ex fights or savage, when they never healed them themselves or did try to do dmg there and been an burden to the co healer. We have the extrem of people, playing ever role beeing just lazy and not even trying, but many many people imo just don't have enough confident and an some toxic people community doesn't help there. Sentences/words like....
"doing dmg is easy", "healing is easy", and so on and the mindest people have towards healers are the issue. No it is not easy to play healer at the highest level getting everything out of you and your co-healer, both dealing a lot of dmg and keeping the party alive. This demands an high knowledge of classes (especially healers and tanks), the fight (mechanic + how much dmg does attack XY) and most importantly confidents in your team and especially co-healer. Also you need to want to do mistakes as stupid as it sounds, because this way you learn your limit as other roles do aswell. An dd for example staying for 1-2 gcd longer on the boss and moving in the last minute to gain uptime. He will die a few times and this has to happen in order to get better at the game. But if healers do these mistakes they will probably wipe the group. Some people i talked to, especially healers aren't lazy, but they don't want the group to wipe, because they "tested their limit".
If you want to help those healers get better at the game and pushing themselves more and more, try to help them by being patient and telling them about healers, who can help them to get better. Don't try it yourself or tell them "healing is heasy, just use cure II all the time, because it heals more. I am a tank and know what i am doing", for instance. There are to many people, despite only about 23%* of people playing healer (most of them not at the hightest level imo) telling healers what do, when they should do it and telling them not doing dmg is the bare minimum. And stop telling them main- /off heal is good. It is not
* http://livedoor.blogimg.jp/tekitou_m...1/810b43c8.jpg