The Catalog is not multi-user. No native collaboration. Adobe’s answer: shared catalogs via network drives (unsafe) or exporting/importing catalogs manually.
Lightroom Classic 2021 (version 10.0, released October 2020, with iterative updates through 2021) was not a reinvention. It was a of a 15-year-old architecture. Its primary promise: unmatched organizational power, local storage control, and a non-destructive editing pipeline that could handle hundreds of thousands of images without choking. adobe lightroom classic 2021
Released in June 2021 (v10.3), this update provided native support for Apple Silicon. Performance on M1 Macs saw up to a 2x speed increase compared to previous Intel-based systems. The Catalog is not multi-user