Difficulty of normal content.

[Kiurt]

I'll say it again. Pay attention to the cast bar of the boss. There's plenty of time to react to everything. If you're waiting for yellow markers to appear, obviously you'll take the hit. You have 3 to 8 seconds to react depending on the mech.

In fact : bosses are just reusing old markers besides a few (like R1) from past raids or trials.