Why is the majority of the content in the game not ilv capped???

[Beeftotem]

Those content that you list has nothing to do with the actual ilv being the problem tho it's either because players did not understand the mechanics of the fight or it is because they were poorly designed by the developers like steps of faith where failing to grapple the dragon more than once = game over pretty much thats why they asked for it to be nerfed. Also content which is recent should be harder because it has to start hard then become easier it's never going to be the other way round, players ain't going to ask the devs to make a fight harder when it has just been released.

I'm also not asking for more challenging content, the amount of challenging content that already exists is fine you have completely missed my point.

I'm specifically talking about balance of ilv of content where there is room to ease the content to clear but at the same time not ruining the whole fight/content completely this is mostly aimed at content which is older from each expansion not the latest content per expansion.

The developers need to go through each dungeon/raid/trial from each expansion and find the right balance of min ilv and max ilv.

After going back and rereading what was said here, I think you are missing your own point, or you don't understand what you want.

You want old content to not be trivial, but you don't want it more challanging. How exactly does one go about doing this? By making a currently ignored mechanic something that can't be ignored automatically makes that particular mechanic more challanging, which in turn makes that encounter more challanging.