This is by design, same as with bitcoin, and IMHO is key to the network's growth and adoption. And also same as bitcoin, it's perfectly possible to build privacy solutions on top of the network to prevent excessive dragnet surveillance and data mining. 
Some of this work is already in progress with wrapped objects, peer-to-peer delivery, relay syncing etc but a lot more remains to be first imagined, then built and deployed.

Everything in its own time. Before PGP messages on pastebins, you need reliable pastebins.