I'm not familiar with Portalarium nor with Richard Garriott so he does not represent the unquestionable figure of authority to me. I never advocated the ability to see each commander on one server. What I'm against is the gathering of wealth in solo and returning to gank in open. This model does not discourage ganking, but does quite the opposite.
You act like you cannot do the same if you choose. There is no advantage, because everyone can access solo mode. No game mechanic is stopping you or anyone else from doing the same, thus it's 100% fair for all involved.
Furthermore, Solo players must accomplish everything alone, whereas in Open, you can have help from friends. Open mode is actually easy mode when you have your mates babysitting you.