One other redeeming quality that gzip/deflate does have is that its low memory requirements (~32 KB per stream). If you're running on an embedded device, or if you're serving a ton of compressed streams at the same time, this can be a meaningful benefit.

> Otherwise, use zstd, which is better and faster

Yes, I do. Zstd is my preferred solution nowadays. But gzip is not going anywhere as a fallback because there is a surprisingly high number of computers without a working libzstd.