I've never used JuiceFS in prod (or any S3 product for that matter), but i was involved in benchmarking juiceFS+garage for archiving based on torrents, and initial results were promising but qBittorrent quickly produced a pathological case where reads/writes dropped to almost zero (and stayed that way long term).

The data and method can be found here: https://git.deuxfleurs.fr/Deuxfleurs/garage/issues/1021

Every software's perf is optimized for a usage pattern and maybe TFA's benchmark or torrenting isn't it, but i was certainly disappointed in the performance i found on 12 core / 144GB / NVME (for metadata) / 6x8TB HDD (for data). In the end we didn't move to S3 we stayed with good old ZFS storage.

I'd be curious to reproduce my benchmarks with ZeroFS when i find the time.