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Actually, .nbt file is an official format of block data that can be imported and exported by a structure block now, and MCEdit (with many tools alike) can read nbt file. The reason everything breaks is the data structure was changed in 1.13 (Known as 'The update that destroys the world').
All my stuff is built in 1.14+ so it won't work with MCEdit for now. If you try something like WorldEdit with forge in 1.14, it might work if .nbt file is importable.
I understand it is a site for .schematics, yet I think it is not only for .schematics files, but all minecraft schematics that can be shared with people. That's why I used to put my stuff in .schematics file many years ago when MC official version do not support .nbt import, but now, I'm starting to put my stuff in .nbt file at the time I made this post.
Modular Base Collection - Episode 1 on January 25th, 2020 12:07 AM EST