Never played FFXI so I can't comment on that, but let's not compare RNG of WKC to FFXIV please. I played WKC for a long time, and yes it took me awhile to get a Fire Dragon Heart+. The difference here is, I could farm the dungeon in WKC umpteen times on end until I got it. For 6 months, players only had one chance per week at any drops in coil. Much easier to get frustrated in this type of situation. So technically it's not on the level of a 0.25% chance of me popping that heart+ in WKC, but if you weight the FFXIV RNG with the fact that it is a finite resource, it's easily comparable. It didn't take me 1 month to get a Fire Dragon Heart+.
Have been static coiling with my FC for about 2-3 months now, and I have seen 1 single BRD item drop. My BRD is already ilvl87, and I didn't need what dropped so I let an FC-mate grab it for its Alt. Gearing up my DRG alt because that's all we see as drops. My brother (mains a DRG) went from i72 to i84 in 2 weeks of coil and spending no myth. And since then I have even gotten 2 pieces of DRG gear as well.
That sole 1 is the BRD loots for my static
