How come Phantasy Star Online 2 doesn't offer offline?

I’ve been playing a lot of Phantasy Star Online 2 (PSO2) lately, and it really got me reminiscing on the original Phantasy Star Online (PSO) and on Phantasy Star Universe (PSU). Both of which I feel have some very fun and amazing offline campaigns.

So I wondered “what would it take to turn PSO2 into a good offline game?” Except, that was met with a slap in the face when I realized it could ship as is and be a great offline game.

Which got me thinking, “How come PSO2 doesn’t have an offline mode?”

Regional Differences of MMOs - A Guide to What MMO is Right For You

From our views on life to the very foods we enjoy, it’s no secret that culture influences us in almost every aspect of life. So, it shouldn’t come as a surprise that games are also shaped by where we come from. In the MMO world , there are three prominent countries that make MMOs: Korea, Japan, and the “west” (Usually referring to Europe, Canada, and the United States)

Korean MMOs