I was curious about the spec of this new GOB format, there's a comment down thread explaining that there isn't a spec yet but discussing some of the details of the format:
https://community.openstreetmap.org/t/new-osm-file-format-30...Aside from OSM specifics, performance friendly formats for spatial data that support spatial indexing can make huge impact on usability and productivity of applications. e.g. trying to view a large dataset in QGIS that has been saved as KMZ (zipped XML) can make QGIS basically hang for minutes, while the same dataset saved as something like flatgeobuf [1] can be loaded instantly.
[1] https://flatgeobuf.org/