I think the poster means that the protocol is not an official standard held by an independent body. That's true, even though it is built around existing standards and is freely available.
I have no doubt that OpenVPN is much easier to configure and work with both for the server and clients. Most of the servers I have configured have been on small, cheap LinkSys routers using OpenWRT, with multiple OpenVPN configurations - an independent OpenVPN network for each network port on the device. Different clients have OpenVPN connections to different servers, and can easily connect to or disconnect from the networks as they require. Each server can have multiple clients for the different VPN networks as needed. Each client can be connected to multiple servers. And both the servers and clients are typically behind at a NAT router. This kind of flexibility is simply impossible with other VPN solutions.