Yes, both Rust and C++ have their downsides. Here are some common criticisms of each language:

C++:

Memory management: C++'s manual memory management can be challenging for developers to get right, leading to memory leaks, dangling pointers, and other issues.
Complexity: C++ can be a very complex language, with a lot of features and concepts to learn. This can make it difficult for beginners to get started, and can lead to confusion and mistakes even for experienced developers.
Safety: C++ allows for a lot of unsafe operations, such as pointer arithmetic and type casting, which can lead to security vulnerabilities and other issues if used incorrectly.
Standard library: While C++ has a rich standard library, it can be difficult to use and lacks some modern features that are available in other languages.
Rust:

Learning curve: Rust can be difficult to learn, especially for developers who are new to systems programming or to ownership and borrowing. The borrow checker can be strict and may require developers to re-think how they approach memory management.
Ecosystem: Rust has a smaller ecosystem than some other languages, which can make it harder to find libraries and resources for certain tasks.
Performance: While Rust is designed to be a high-performance language, it can sometimes be slower than C++ in certain situations.
Tooling: Rust's tooling, such as its package manager (Cargo), is still maturing, which can lead to some frustration for developers.
These downsides are not necessarily dealbreakers, and both languages have their strengths and weaknesses. Ultimately, the choice of language depends on the specific needs and requirements of a project.
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