Aside from the ping in clown scenario, every other one of those situation is a scripted and programmed pattern at set bars though. Valtan doesnt have mix ups with his swings, Vykas will tell you what orb to grab at what time, Players know what the stagger mech will look like in brel. No raid mechanic is going to sneak up on a party and its up to the individual player and party to be ready for those mechs when they appear.
I 100% agree the game is flawed. Honing is a dogshit system for progression. 3 entry counts on the 5 possible raids players have access to is dogshit. Paying a made up market tax to polish up your Party Finder resume is a dogshit player market system. But the Combat is great. The combat is the best out of an mmo i have played in a long time and its the reason that i have sunk 2800 hours into the game. Amazon has made some blunders, but this is the best state the game has been since launch.
Slap an edit in here
Realistically, No story content is tied behind legion raids after a bit of digging, Rowen at 1445, Elgacia at 1460, with the Normal mode dungeon at 1475. Nothing is forcing you to actually run the legion raids, if raiding is something you want no part in