As someone who does things when they come out and cannot have foreknowledge about fights, I find it weird that you say you "need to watch a video" instead of just learning from a few deaths like everyone else did before?

Eden-Ramuh's mechanics, while brutal (Stratospears in the ground) are easily telegraphed for over five seconds, even in Savage (by telegraphed I do not mean the orange ground circles but rather the "safe spear"). To say you have to know within 1-1.5 seconds is a hyperbolic reaction and is simply not true. If you have trouble to find the right spear "with all the other junk happening at the time" I recommend reducing the visual effects of your party in your Character Configuration, because that is the only other thing going on besides potentially Stormclouds forming on two players.

While the fights get more and more lethal, the devs kind of expect players to gradually improve over time or learn from mistakes - which is commonly accepted in parties. I have yet to have an Eden-Ramuh (Normal) run where a player ragequits instead of learning from his mistake or, if he can't figure out the reason for his death, to just ASK the other players in the party about mechanics.

It isn't that older stuff was too easy, but players should expect content to gradually increase in difficulty within and / or between expansions as we level. The difficulty within Extremes and Savages increased as well, so if Normal mode were to stay the same difficulty as before (i.e. not scale accordingly) then the skill gap required would widen even further, making Extreme / Savage look like a distant goal when it actually really isn't.

I'll be humble in my opinion - I genuinely prefer the boss giving me instant-deaths when I don't have debuffs because then I can at least tell that I am NOT supposed to stand or do whatever I did there.

If your issue is that "dying makes you look like an idiot", that is a mentality issue, not that the players require you to know it since it IS normal mode after all.