Again, the issue has always been with making an add-on for Blender that is maintainable, clean and satisfies BF. Sometimes when an add-on is popular, useful and cleanly written, BF will maintain it officially. There are only so many add-ons that qualify. Most of the Blender add-on that deal with IO are half-a$$ed and at one point they break due to Blender API changes and no one fixes them. That’s why OpenGEX could quality - it’s being maintained (last time I checked).
If someone can write JSON exporter, fine by me. Just get it done right and maintain it 