Your play / gearing / and build is likely not typical, and to use it as a loose example is effectively gaslighting other players into believing there isn't a problem or its not as bad as Smoke makes it out to be.
Because knowing DDO's mechanics, the experience of the Raid, and knowledge of your own characters limitations, doesn't make you more skilled than others at performing well in DDO?
Also, the example was given in that there can be players out there, more than capable of solo'ing the run for the 11 other pikers, but if they pop up on a class (like a Wizard) that others are shunning, then it reaffirms the issue OP was describing.
But yes, I will agree, that it also highlights that the core caster issues that are brought up often by some forum goers (including yourself) on that casters are in a bad situation, does look bad when compared to mine and what I can do on a caster (Wizard of all classes, which is often touted as the worst).
Whether it was play/gearing/build, it doesn't matter. Do you know why? Because all of my test toon builds use common things in DDO to prevent myself from ever being nerfed by the Devs.
Note, this doesn't mean I don't agree there's issues for casting casters. For example, casting casters can never cast more than 1/second or 10/10 seconds or 60/60 seconds, etc. Contrast this with other dps characters that can breach the amount of attacks per 1/10/60/x time and caster damage being limited when compared to them becomes very noticeable. And this uses the assumption that there is no Spell Points bar to every be worried about.
I get what you're saying, but if you have roughly any killcount in Threats you're doing something wrong as a DPS - your main job is to hit the biggest chunk out there and cc/ignore most of the trash mobs. I'm happiest if my top dps has 0-6 killcount - it means he wasn't hitting things he wasn't supposed to.
The killcount is mentioned as there was ranged and another caster in the mix (who was too busy dps'ing instead of tackling the trash when they should have been, likely lack of experience in Raid).
The rest is to highlight that some players have become "stuck" in a way of viewing casters as is. Much like how the old glass cannon dps'ers were like prior to LVoD (and then subsequently got humbled by it and changed appropriately). As mentioned above, yes, there are issues. But some issues can be mitigated or are a non factor but are heavily being leaned into from arguments on why casters are in trouble and need support.
J1NG