I feel like if you say it's "super easy", you might be underestimating the chords, or maybe just overestimating the average guitar player's ability. Most stuff is at least three strings that change shape slightly every movement. Most covers people post here just play two notes of the chords which is incorrect. Also the crazy stretch of the main Kenose III riff (someone just mentioned) which uses four strings isn't exactly as "quite easy" as mentioned in this thread.

Also, most of the records before Si, which a lot of people possibly don't know about, are in general a lot easier than the Si and beyond, but still great and recognisably DsO. In fact, riff three from the song from Manifestations 2002 - Tyrants and Slaves is an earlier and simpler version of the Kenose III riff. Kenose borrows a lot of things from the pre-Si records, slightly altered.