Hi ragdog,
Its mainly because I use RadASM v2.x branch, and i remember trying RadASM 3.x (good few years ago at this stage) and found some things werent working or hadnt been implemented yet to allow it to be feature compatible with 2.x branch. I cant recall offhand what bits i found missing/not compatible as it was a while ago - might have been something with the templates or something else, or down to user experience/usability with the menus/gui - knowing where things where and how to modify settings for some things, or a combo of both.
So it was done for my own usage and requirements mainly and to then overcome some small issues i found in 2.x, and then I decided to upload the changes to github in case others found them useful. I might take a look at the 3.x stuff at some point, but at the moment im happy with what im using.