At a rate of whopping 1 per day, so it's a pain in the ass.
Second Anniversary update will update that to... 50 per week, I think? I can't be bothered to check. Either way, it's FAR LESS a pain in the ass.
In overall QoL improvements we'll get in the future are HUGE. From shortened gem gatcha, simplified animation of gem gatcha, easier changing of party composition, to overhaul of weapons' skill leveling process (that's in next October I think). There are many things to wait for.
I am back with my stupid short testing sessions results.
As I've got Morgan this event I thought "why not check this triple attack buff" and so I did. All percentages are taken from JP wiki.
Ares with her assist's boost (30% DA, 15% TA), one 2% DA accessory, Awakened Tit buff (50% DA, 30% DA) and Morgan's guaranteed TA buff.
32 attacks done: all were TA.
Got some additional samples for Ares with her assist's boost (30% DA, 15% TA), one 2% DA accessory and Awakened Tit buff (50% DA, 30% DA).
125 attacks done: 78 DA, 47 TA.
Also checked how Morgan's guaranteed TA interacts with Cagliostro's guaranteed DA and... results are quite interesting.
Only 11 attacks done: whether DA or TA occurs depend on which buff was applied last, so if Cagliostro's buff was applied second it was always DA, if Morgan's buff was applied second it was always TA.
It may very well be possible that Morgan's and Cagliostro's buffs work differently than "guarantees combo attack" buffs (at least Daphne's buff's description is different than those two).
Yes, they are. For example Awakened Tit buff gives 50% DA buff and 30% TA buff, so with normal Kamihime it'd be 58% chance for DA and 33% for TA, which leaves 9% for single attack.
As for buffs stacking with each other, it depends on buff frame. DATA buffs rarely stacks (for example Awakened Tit buff will overwrite Herc's DATA buffs). I assume here that Ares AW assist stacks with Awakened Tit buff (or any DATA buff in general), which so far seems to be the case.