Thanks for your well thought out postBut I guess you can see your own bias, you do your homework and love the challenge and overcoming it, I do too. But all the recoveries from mistakes you mention happened in the end-game, you have good players already pushing through the hardest content. I think at that level things are fine as they are, it's new content, what we are saying is that even that content should be doable EVENTUALLY by players that are simply unable to dodge every mechanic.
Fixing this is as easy as, instead of this mechanic not being instant death, it does something like 6k damage! Pretty much death for anyone with current gear, but in 2 months even DPS might have 8-9k HP and be able to survive one of those. In this way gear is more relevant and becomes increasingly more relevant as time goes on and content becomes accessible to more people, simply because they have better gear.
Like it or not, there's plenty of players there that need that 25% echo boost to even stand a chance, I would argue that eventually maybe 3-4 months after content is released, it'd be possible to be 50% stronger than those who cleared it the first time, so echo 25% + gear 25%. Right now there's plenty of mechanics that even with 100% of a boost you cannot survive, Titan EX keeps coming up in this respect - give us 25% knockback resist with echo, that way if someone runs to the middle they might die but least not be knocked off etc...
This is what we mean by balancing the mechanics vs gear dependency, if it's 100% mechanics and 0% gear, then you either memorize the patterns or you'll never beat it. If it's 90% mechanics and 10% gear, it's unlikely to be possible for a group of unskilled players to beat it, but a couple or few may be able to beat it with others carrying them.
Frankly even an encounter at 70% mechanics/30% gear dependent will be very hard/unbeatable by some casual players, now put yourself in their shoes, you can't find a group of 8 that can dodge mechanics reliably for the life of you, higher levels don't care about you, nor can they help you much. And you've basically reached the end of the game, it's stonewalled and you're frustrated, some will keep practicing others will give up.
Now imagine if there were alternative paths to try to get better gear such as, quests, materia, buying better gear, this gives them something to strive for, they can get closer and closer to winning, you can't improve your ability to dodge, you're just not that skilled, but you have a way around this, and at least one day you know you can beat it, isn't that a lot more optimistic?
The hardcore can have their insta kill, 100% mechanic battles, knock yourselves out and you deserve the best gear for that, the casuals shouldn't have to face something so frustrating, unless they go off the beaten mainstream/casual path for a challenge, I'd be happy if they did, but not everyone's the same.