Earlier quoted context omitted.
You're assuming that everyone's "prod" is a Linux server. I would say that MacOS needs containers for developing Darwin software.
Yes, I think that's a perfectly reasonable assumption given that (AFAIK) the only current "containerization" (as GP used that word) strategy is on Linux. BSD has jails and Solaris has something similar, but as far as "fire this thing up with its own pid, network, and fs namespacing, and allow me to constrain it easily" that's just Linux. I guess put another way: you run Darwin in production? As for the latter, macOS…
No one used that word