You know why it's not v1.0? Because I don't make stuff halfheartedly. When I do something, I do it right.
You say Netplay is more "completed". Define "completed". I define it as lagfree, bugfree, stable and covering all important features which RMX-OS does better than the other systems even though it's not version 1.0 yet.
Do you know why there is a version 3.x of Netplay+? Because they are still working on it. It's been 5 years and it STILL has bugs (one of the reasons I am making RMX-OS is to replace Netplay+ 3 in an MMO project because it's too buggy). v2.0 was the first to have SQL data saving. And that was only data related to the MMO engine itself. RMX-OS has SQL data saving since the first release which was version 0.8. It is a critical feature and Netplay+ didn't have it until version 2. "Completed" you say? Right.
Also, RMX-OS doesn't save only MMO engine data, but it can be configured to save absolutely anything you want. You can use the Pokemon Starter Kit which is a very, very heavily modified version of the RTP scripts. It has completely different data and you can't simply save that data with Netplay+ without having to edit the Netplay+ script, most probably the Netplay+ server as well and even the database itself. In RMX-OS all you have to do is configure. No scripting, no Ruby (except for the basic Ruby that you need to configure this complicate part) and no SQL knowledge. The first time in the RMXP history it is possible to make an MMO WITHOUT having the need for a scripter.
I have used and worked with Netplay+. It's alright, but it has some really major flaws that can't be simply fixed without revamping the entire system. And nobody's going to revamp Netplay+. Instead of fixing the stuff that isn't working properly, they keep on adding features. You don't build a house on a bad foundation either so why are you doing that with software? -_- I bet Netplay STILL has the bug where chat messages get lost during transfer (which is present AT LEAST since version 1.7).
So before slandering about any of the systems, you should first know some facts.