When it comes to memory management and ease of use the downsides of C++ and Rust will depend on the specific application. In general the C++ compiler will allow you to do more things than the Rust compiler but these things are potentially unsafe. In practical terms that means that you will likely spend more time dealing with compile time errors when writing Rust code compared to C++ code but in return you will have fewer potential memory-related issues at run time. For a short and simple program such run time issues may not matter but for very complex programs that cannot afford bugs spending more time on development may be a good trade-off. There are also things such as computer graphics or doubly linked lists for which no efficient and safe (as determined by the Rust compiler) implementations are known.

So in terms of downsides: C++ programs have more potential for bugs at run time while Rust programs will likely need more time to develop and will still require unsafe code for some problems.
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