Because every expansion where they had no cap and nothing to slow us down we had an influx of “There is nothing to do” complaints because everyone tried to get everything done as fast as possible, then spent 3 months with nothing to do.
That’s bad for Blizzard, because many people will sub for a month at a time and than leave for as many months as it takes them to release the new raid. That’s bad for Blizzard for obvious reasons, but super bad for us because when everyone is done, many just take breaks and leave, no one to run raids with, no one to run keys with, no one to PVP with, zones being dead to the point you cannot even do open world content.
Do you really want that? Try to run an alt, try to push KSM, KSH, AOTC and CE, try to get some achievements done, but have no one to play with? Not only does staggering the content help, but releasing a raid that is easy helps, it allows more people to raid and push higher content. Doing continual tuning in M+ and releasing more content like 10.0.7 and 10.1.5 also helps, it means there is more to do and more people can get involved.
We are seeing more people calling themselves casuals who are getting KSM and AOTC, and that’s good for us, it means happier gamers and more people willing to put in more time to play making the game feel alive.
Part of what was killing this game was Blizzards refusal to make content more accessible, it was one raid per 6 months on average that was hard enough that many guilds could not even clear the first boss on normal, the RWF was taking 300-400 pulls on the last boss and becoming a snooze fest, players were either smashing all the content in the first week and leaving, or spending so long on raids that it tore guilds apart and made people leave.
Now with easier and more content it means more players will get done what they want, the only problem now is that with raiding being so easy the top % of players will have nothing to do, which is not so bad considering how small a number of players that is, maybe a Raid+ scenario could fix that, continually scaling, smaller group raids, but for the overall playing base it just means we can all get access to more content and at a more regular interval. No one can really argue with that.