Is this truly wrong?

[Luin]

Yes, thats why I suggest SSS to figure out wether its someones rotation thats a problem or if its mechanics. (afaik SSS is also calculated without party buffs and the like in mind - its basically really telling you wether or not you know the "mechanics" or "rotation" of a class well enough and if you're geared enough to pull the DPS required)

Most SSS dummies are overtuned. Remember NIN SSS for Delta? Or MNK this patch? 5500dps to kill that dummy. (Sam was 5660 too!) It was nearly impossible to beat with 4.1's BiS even with pots and food, but plenty of low ilvl monks and sams went and cleared o8s regardless with much less than 5500dps for Clown on wk1. Alexander's SSS was also notoriously bad.

My point is without actually watching someone, it's difficult to pinpoint exactly where the problem is, even with logs.

Edit - IMO SSS should be at least 5 minutes, preferably 9 minutes long. You shouldnt need to alter a proper raid rotation to fit more buffs in a 3 minute dummy fight, when there are no 3 minute fights. At the least it'd be a more accurate dummy.

[Vidu]

Most SSS dummies are overtuned. Remember NIN SSS for Delta? Or MNK this patch? 5500dps to kill that dummy. (Sam was 5660 too!) It was nearly impossible to beat with 4.1's BiS even with pots and food, but plenty of low ilvl monks and sams went and cleared o8s regardless with much less than 5500dps for Clown on wk1. Alexander's SSS was also notoriously bad.

For my point thats actually even better, because, let me repeat this to you: Its about figuring out wether or not you've got enough knowledge and gear for that fight on the job you're trying the dummy with.
I'm not saying that killing the dummy means that you'll clear the fight.
Or that not killing the dummy means you wont clear the fight or wont do well enough in it.

We've already agreed on fflogs not being a real accurate representation of dps and performance either, at least not as long as you're only looking at rare numbers, because they dont take into account your gear, the party-buffs, how well you dealt with mechanics (that might require you to disengage the boss - for example in my static I'm doing Typhon in O6S. I'm the OT - not sure if our way is ideal, but its how we're doing and clearing the fight for a few weeks now. Works. But also means that I'll lose uptime on the boss), if a SMN/RDM raised someone (which might have saved the group - in my book a person who raises a healer is better than the person who pushs for more DPS, specially if the dead healer leads to a wipe) and so on.

So my whole point is to use the dummy in order to give yourself an idea if you're skill- and gear-wise ready for this content.
If you beat it with or if you're getting at least close to beating it (<5% left), you should be fine in general.
If you're not even getting close to that, you know something is wrong with your rotation or your gear and you can check for that.

On a very basic level I'd say bad parser can come from two things:
Not enough knowledge of the fight - or not good enough at the job (thats meant to include gear and skill).
SSS lets you test wether or not its the later.

I'm not really sure what your issue with the idea of testing that this way is, to be honest.
I've never claimed not beating a dummy means you're to bad for a fight - but I'd dare argue that not getting close to beating a dummy (>20% left) means you're probably not ready for a fight yet. From there you go anf igure out why - so: gear or skill?