The reason memory safety is interesting in the first place (for practical, not theoretical reasons) is that it is a common cause of security vulnerabilities. But spatial memory safety is a bigger problem than temporal memory safety, and Zig does offer spatial memory safety. So if Rust's memory safety is interesting, then so is the memory safety Zig offers.

I'm a rabid software correctness advocate, and I think that people should acknowledge that correctness, safety (and the reasons behind it) are much more complex than the binary question of what behaviours are soundly disallowed by a language (or ATS advocates would say that from that their vantage point, Rust is just about as unsafe as C, and so is completely uninteresting from that perspective).

The complexity doesn't end with spatial vs temporal safety. For example, code review has been found to be one of the most effective correctness measures, so if a language made code reviews easier, it would be very interesting from a correctness/security perspective.