They don't have GC so they either make programs difficult to write (Rust) which hinders delivering secure replacements, or have use-after-free security problems (Zig) [1].

Use a GC when you can, it's the biggest programming productivity and quality improvement in PLT of the last 60+ years.

[1] Though I know Zig has some interesting mitigations, some used and some under research: https://news.ycombinator.com/item?id=31853964 https://lobste.rs/s/v5y4jb/how_safe_is_zig#c_vddk9j