Capella doesn’t get used much by me because it’s honestly a pretty disappointing skill to use and costly to do so.
The main benefit to using it is being able to keep stoneskin up 100% of the time for boss fights. The problem is the capella’s have a very low hp bar and can be knocked back. I’m only level 180 and my capella is already basically being 1 shot by bosses in the daily missions which makes it a waste of 1k. Next problem is they can be knocked back making it difficult for people to find the buff area. They also require your party to know they have to run in and out of the glow to re apply the buffs and with that they also likely don’t know how long the capella lasts for and might miss out on last second re buffs. I’ve made a macro to explain how to use capella when i’m in parties but often times people ignore me or think as long as they stand in the buff it will get re-applied.
Aside from that capella is also not useful for trash mobs in dungeons due to the fact that the duration for all buffs are lowered to 35 seconds at max level in exchange for re-buffing stone skin. but the problem is after the 30 seconds it takes to kill all the mobs the group will be on to the next pack of mobs leaving your capella behind and you now have to use another holy water for asperion, another gysol for sacrament and another holy powder for blessing. I mean it’s not exactly that expense at higher levels but you also can’t pretend that the extra rebuffing time and cost is worth another 30 seconds of stone skin on a trash pack that will be dead before it even wears off.
Also to add: bosses seem to move around so much that often times it’s not worth it for me to throw a capella up when people don’t understand how it works due to language barriers or whatever reason. then everyone runs to the other side of the arena and it just sits there uselessly for 72 seconds