There’s nothing at all wrong with going back and doing legacy raids and other content. The achievement system, cosmetic rewards and titles, and most recently transmogrification all serve to reward that playstyle. There’s also a lot to be said for just being able to revisit old locations, for the sake of nostalgia or getting to experience them for the first time, without needing to find a like-minded group. As Rygarius noted, we’re committed to making sure that we don’t disrupt players’ ability to engage in that gameplay.
Without getting into the math, our goal is to make sure that if Kael’thas’s Pyroblast does damage equal to 10% of your maximum health today, it will take off no more than 10% of your health post-squish. And if you kill Onyxia in 30 seconds today, you’ll be able to kill Onyxia in 30 seconds post-squish.
Watcher, on a forum question about soloing legacy content
I am not sure where I stand on this. On the one hand, it can feel a bit cheesy to go back and slam-dunk level 60 raids with your purple equipped level 90 character.
On the other hand, that cheesy feeling never stopped me!
40 people for just this guy?
Or our group. Roll on with the status quo I guess!
The Ancient Gaming Noob 
Funnily enough I was musing on just this topic late the other night as my Berserker ripped through Anchor of Bazzul in the few minutes I had to spare before bed. It wasn’t all that long ago that I was leading a guild group through that instance at a very cautious pace, taking the best part of an hour to complete it even though it was, even then, nowhere near current content.
Going back to content that once gave me a lot of difficulty and slicing through it like a hot knife through butter is an enormous pleasure and one that I would really hate to lose. With systems like GW2’s map scaling I can see that developers could render all content roughly relevant to all players at all times, but I think that would be a mistake.
For any MMO that lasts any significant length of time there will eventually be far more content available than players can form a critical mass to attempt on anything like a regular basis. There will always be newer or more favored areas where the bulk of players congregate and if the rest of the dungeons/zones/maps/instances remain as hard as they were when they were the content du jour then they will rest idle for most of the time.
If players want to experience that content years late at anything like the original difficulty (and it will only ever be a rough approximation) they can, as is often done, find like-minded souls to form progression guilds or groups and/or start new characters.
Yes, there are arguments on both, indeed on many, sides of this one but on balance I’d rather have the godlike hero slumming through his past model than any always-on version.
My 40-year old self is holding his head in his hands and moaning in despair at the vision of what he will become, but hey, that’s his problem. I’m not him any more.
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I hit the old dungeons every time I resub to WoW. It’s like a double whammy of fun nostalgia and a showcase for how untalented WoW’s current designers are.
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It’s a blast.
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I would really like if they added a “scale my char down to level X”, so that I can choose between steamroll mode and “real feel” mode! not to mention the ability to experience them with lower-level friends….
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I love soloing old content at 90. A lot of it isn’t terribly challenging, but there’s definitely a good bit of feel good for some of it. My personal favorite so far was soloing Ignis from Ulduar on 25 Heroic.
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