Quote: "I have zero issues with X - it would much prefer it to stay.
Have not had an X model that does not work properly in the GG - if it ain't broke, don't fix it "
It's okay if it stays there, especially for the purpose of backwards compatibility. However, the file format has been deprecated since 2014. I see little reason to use a deprecated file format as the main means of getting models into GameGuru MAX. Especially when other formats, such as GLTF are so much more robust.
I just checked the 3D programs I use to create 3D content and none of them natively export .x, though I am guessing I could find an add-on to add it for Blender, at least. However, all of them export to GLTF 2.0, with the exception of ZBrush, which only exports to OBJ anyway.
Intel i7-5820K 3.30GHz (overclocked to 4.0 GHz), 128 GB RAM, Nvidia GTX 1070 8GB, Windows 10 64-bit, dual monitor display