Old content has become so easy that it is no longer fun

[Seraphor]

Knowledge has absolutely nothing to do with it. Knowing the fight doesn't make AoEs that would kill me when the content came out only do 20% of my HP instead, nor does it make the bosses die 300% faster.
That's not an exaggeration btw, this is the actual numbers for some of these fights.

I've seen wipes in crystal tower raids as recently as last week.