Take Bards skill soloely for example, it doesnt sound so much of a healing that would keep you alive from the bosses you are talking. But ingame, that abilities bard uses with the help of its other abilities seem to do something, right? And you can talk about bard because its experienced right? You can't make solid impressions, explanations on something that has never been tried before. You seem to forget that support/heal wiz/sorc or sorc/wiz isnt a replacement, you seem to forget that your stat points dont do anything if not for your armor. [...] Also I bet you dont play your Wiz/Bard as support, anyways. Its probably for personal benefits and Im not judging, play your wiz however you want. Youre only expert on Wizard. So why do you keep looking from a dps Wizards perspective? This build is obviously not about dps, so why are you looking on DPS perspective? If my damage is relatively low to others, why dont i go enhance my healings even more? You know how much heal does those healing abilities, when on a dps build. Bards heals are bad too, if they dont upgrade their heals you know. Also, Bard is a burst healer. Nothing like Wiz/Sorc healings. Yes there is ballad, but ballad is often just used for the buff it gives + the over time heal for squishies. Have you noticed ? When a boss hits, it recovers quickly with Ballad. The monster doesnt wait for your ballad to heal, too. As Reju prayer and mantras healings may be low compared to ballad, they are still healings. You cant compare a bard whos upgrading heal and a wizard who goes dps. Compare them both on the same build. Compare those skills to how effective they are, not by "this is lower than this... then thats bad." This could go the same way with damaging abilities. For example, x does 5 damage, but y does 7 damage. So can you say x is not worth it ? No you cant. If the target has 20 hp then x is just as good.
Taking in concern with the bolded statements:
It's actually quite ironic but DPS classes actually can heal equal if not better than Bard mains without putting a single point into Heal tiles or any Heal% gears, because DMG+Crit+CDMG scale SO well with heals that current main bard meta today is actually more DPS or CRIT focused gear rather than Heal/HP gears. This is part of the reason why traditional heal/HP bards were cast out of most relevant meta starting about late 2015 - 2016 in terms of them not being particularly necessary anymore.
Ballad isn't used for its heals either, it's primarily for the mastery buff and the 3x Notes buff.
Also, bard sub heals are in no way bad. As Zessen mentioned, Healing Harmony is particularly broken:
You pretty much can cast this infinitely without cooldown worries, so going DPS Wiz/Bard actually would play as a better support than Wiz/Sorc esepcially if you were to use nothing but Rej.P and sub bard skills, and endgame-wise the things you get debuffed with are either minor enough to ignore or can't be cleansed at all, with very very few exceptions.