The double-edged sword of bouncers is that they try to strap the behavior we're looking for on top of IRC which forces them to do it in a convoluted way.
Connecting to multiple networks with a bouncer has always felt like a kludgey disaster to me because of this. I don't want to have to define another connection from each of my actual clients to my bouncer to add another network, I just want to add another network. When I get a new system or reinstall an old one I don't want to have to set up a half dozen connections.
Quassel gets this right and keeps things separated. All IRC network settings exist at the server (bouncer) only, the client needs nothing more than a username and a password for the server and gets everything else from there.