Phantasy Star

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?”