Id love to see that Bard build because that damage output sounds great even if its an exaggeration.
BTW caster arties can heal and trap so do have some versatility too.
I do not believe an artificer can heal anywhere near a spellsinger, even if we totally ignore echoes/shout/gshout healing everyone to full. Artificers can heal with the vials which are extraordinarily slow and constantly miss or converter which does very little since the target won't have repair amplification compared to the actual 'heal' spell spellsingers get. Not to mention only one target can have converter and lose it constantly unless you gathered ALL the cookies and even then using 4 cookies every five minutes is a no-go.
I'd like to point out that I've done epic completionist x4 on pure artificer and racial completionist x3 minus the eladrin which I don't own almost exclusively on artificer. Gave up on my main being artificer after the runearm nerfs but kept my alt artie. So I believe I know them well. Not perfect but well.
The bard build is 19 scoundrel for ash and 2xEnchantment bonuses, 41 spellsinger for capstone and spellsong, 21 warchanter for temp hp, 12 swash for swf working with buckler. 38 fatesinger, 23 evasion/mantle from primal and 21 sentinel for defenses. I am missing a single epic destiny point to get nature's blessing (I have 1 left floating). Bone with tar, iod 5 set, echoes set, elder's set. I am missing all the btc items because this is my main's first time staying epic as bard such as alchemical buckler or the raid versions of IOD items such as attuned weapon and raid boots or the killing time necklace which my alt permabard has. I also have nothing from myth because I don't own that. I am pretty positive with the correct gear I'd do WAY more damage. I also did hp feats instead of DC on this build so I have to assume if I did evocation focus instead of swf then enchantment specialty I'd reach near no-fail levels.