Well, most likely Epic wants to avoid becoming Frankenstein Engine stitched from 3rd party solutions. Like the other engine…
They did build their own enterprise asset management tools aka Datasmith instead of just posting blog posts on 3rd party tools. And continue to build their own support for working with Blender, Houdini.
They bought guys behind Skookum Script, but didn’t just quickly stitch to the engine and called it a day. Probably working on a scripting language that would fit better and perhaps reworking some things in the engine for that.
And maybe just 20tab refused to be purchase by Epic and that’s it. Epic went on building their own tools. Or just engineers didn’t like something about their tools, don’t know, haven’t use it