Where are the Raids??

[Torquil]

In what raid, in any other mmo have you fought 2 bosses simultaneously? Adds do not count as they are not a boss.

I could really blow this out of the water and make a list two dozen long, but I won't...

The Rathe council in Everquest 1 (and source of the MMO term "council fight" which is a raid boss that consists of many individual target-able bosses. There's literally a term for what you are describing).
As early as Everquest 2's first expansion (perhaps early...but this is the earliest instance I'm aware of) there is a type of fight that involves 2 bosses and keeping them at roughly the same health. The first raid of Alexander in XIV is similar

That said, I don't think the number of bosses in the "boss encounter" matters to the OPs original point. You could easily have trials that involve multiple bosses as well.

The fundamental point is, there is nothing within the duty itself that differentiates an 8-man raid from a Trial. You are not "raiding" a "space". This has gotten worse with every expansion release. Fundamentally, I blame the fact that they feel the need to make the 8man raid's separately queueable. As long as that is a fundamental design point, you'll never get away with the "raids feel like trials" problem.

(This isn't an actual argument point, but I'll point it out since it's kinda funny. Not only are we not "raiding" deltascape, we're literally invited/threatened to participate. )