It's an extremely old design, designed primarily for read-sharing and with its concurrency features retrofitted. It worked absolutely fine for network-booting diskless Sun workstations in the 90s but its failure modes are just too annoying for modern usage.

Trying to do anything like a database (and the 'git gc' process described is exactly that, a tiny database) over NFS requires the use of very specific techniques to get right.

Sibling commentator has it right - for unreliable WAN networks S3 offers far better semantics, because it's not quite a filesystem.