I read that commment as well but if you need to use the Zig build system it means you won't be able to integrate Zig into an existing project as easily, you'll have to integrate the Zig build system or even to integrate your project into the Zig build system, and that's an another level of complexity entirely.

There are enough people who care about adding zig to existing projects being easy (including the zig BDFL) that I would hope that this approach won't be stabilised until they're confident that it isn't adding enough extra complexity to spoil the experience.

I mean, we'll have to wait and see, and there may be a transition period during which things kinda suck, but zig has a pretty good track record here so I'm more optimistic than I would be in most cases.