It's very depressing how...

[NyarukoW]

...It's all luck based; I only cleared Twintania because I had the fortune of a group offering to carry people for Soldiery bonuses. Every other attempt failed in ways that I was powerless to prevent.

It is so not lucky based. The coil fights are tightly scripted with limited RNG windows for the boss mechanics. You don't clear them without putting in the time an effort to recruit, organize, and coordinate, and practice. You got lucky because someone else put in all that effort outside of T5 and just need someone to provide soldiery bonus. This challenge only get harder with more current content, and probably harder than the boss itself, especially with the attitude of people not wanting newer players, being all exclusive and all.

The thing is if you give up on other too quickly like in less than 50 wipes, you should expect treatment of the same which make this problem even harder. It take time to find, create, maintain a static that can tackle some of the newest/hardest content. Sometimes you discover DPS or gear checks that the group is not geared up for and you need to go help the group farm for upgrades. You need to take the long view, and by helping others you help yourself. Wipes and fail are normal, you may be powerless to prevent those because people need the time to learn and space to practice, but you have the power to patient and inclusive and help them overcome those and over time you will have helped group earn the clear, for both you and them together. Bringing people together and playing together is good thing.