/agree with Elwoods!

But on-topic: I agree things should be relevant (like the World Event achieves-- gotta do them while the event's going on) BUT going back to do, for example, MC past its relevance is an achievement in a way, too. Some people couldn't be bothered with going back and doing old raids because they're just that: OLD. No relevant loot, nothing special, nada zip zilch, I wave my hand at Magmadar and /yawn, he falls down, etc.

For some people, the incentive of getting an achievement is enough. A lot of people, like me, have never seen the content and *want* to just experience it, even if it's a watered down version of it. I did it at 70 with some friends: It was still challenging to a degree and, for people who were now used to flying around Outland, we had to find the nearest flight path and then ride there by ground. Plus, there's attunement! So what was originally one run and maybe two hours of romping through fiery doom is now two runs and three or more hours of romping through rocky fiery doom plus fiery doom.

If anything, the achievement that pops up at the end of the run, regardless of level, is a hat tip to those who have the dedication to go there past its relevance, whatever their reasons (or lack of reasons) might be for doing it. As much as I would like to have been there at the opening of Ahn'Qiraj or the Dark Portal on BC launch, I wasn't and I don't have that achievement. I can say hi to AQ and Blasted Lands as much as I like and still won't get it. An idea that I'm sure has been brought up many times by many people is to have a tiered system for achievements like this-- e.g. an achievement for doing it at level 60 (or below 70) with an appropriate group of peers as opposed to an achievement for just doing the instance at a higher level.