> The two general's problem is a great piece of reading on this topic

It is!

And the solution is to add an extra general on the left side. Let's call him Outus Boxus. The two generals on the left side can communicate in perfect lockstep. Then if you need the general on the right to find out about something, you can send a few workers to tell him or something...

More seriously though, you can have a DS for two reasons: tech or political.

Tech means scaling or reliability. So clients can be serviced by any of the nodes.

Political means different actors don't have a central authority. You can't stick two banks into one db.

This technique doesn't seem to address either aspect.