Actually, it's quite easy if you get decently competent people. No, that doesn't mean orange caliber WF raiders. Even an average player is perfectly fine, provided they're putting forth an effort and contributing at a decent rate, i.e., a Samurai doing in the ballpark of 6k. Funny enough, I pugged Tsukiyomi EX with four randoms and three friends. We wound up doing parse runs and trying to phase her early and skip the second half of phase two. Four randoms and we're pulling meme shit because everyone knew what they were doing, we're friendly and contributed. Walked away with a dozen or so clears in only a couple hours. Likewise, I met my BFF in a random party whom I now raid with. If I followed your sagely, totally not bias at all, advice, I wouldn't have either of these experiences. I suppose it's just pure toxic of me to put in an actual effort.
Here's the difference, Riyah. When I started tanking Shinryu EX, I joined learning parties despite having cleared multiple times. I even had the dog. Why was I in learning parties? Because I didn't know the fight from a tank perspective and wanted to brush up on mechanics so I wouldn't be a liability. Meanwhile, in a Tsukiyomi EX party, I have a Samurai doing a 1,000 DPS less than me despite having better gear. But when I mention our damage is low, he calls me shit.
So... who's the toxic person in this scenario? I'll give you one guess who had a magical abacus and who didn't.
People who try and improve will continue doing so through learning parties. Contrary to popular belief, raiders are pretty chill if you're putting forth an effort. I've partied with World First raiders and most of them have all been quite helpful. The only people a parse keeps out are lazy, inconsiderate people who feel entitled to your time. If someone's too intimated to improve because parsers are now okay publicly, they have no business being in farm or clear parties until they're ready. How do you they'll feel getting kicked silently, with no explanation whatsoever on what they're doing wrong?