Given the choice between Subclipse and Subversive as well as needing specific versions of the the plugin based on your repository, bundling a Subversion suite with MyEclipse might make things more difficult for our users.
It is evident, however, that this is a significant pain point – we’re looking at how we can make the process of adding Subversion support to MyEclipse a lot easier for everyone.Tom Hunter commented
By far, the number one issue I see with MyEclipse is the lack of Source control integration. Pick one plugin and make it work perfectly. I don't use Git but I would hope you would do the same thing with Git. Make MyEclipse work perfectly out of the box with those.