It's understandable. Before glTF, there really wasn't a good non-secret/proprietary format with which to deliver 3D content. But, now there is! Use it!
GlTF is a runtime transfer format and that's mostly how I'm going to use it. Others at my employer need to do VR work, and sometimes that requires the geometry to make a trip through something like 3ds Max. It would be nice if Autodesk acknowledged the existence and utility of glTF. People want to move away from FBX so Autodesk are unlikely to provide glTF support until it is demanded of them by a large enough portion of their audience.
Once I am done with this Creo View stuff I will look at writing a 3ds Max import plugin myself. It would definitely get used by my employer.
Writing an importer for those ASCII files is easy, and when you have the binary and ASCII versions of the same files side-by-side, working out the binary file format is made much easier.
I haven't even begun work on a 3ds Max importer.