[UltraViolence]

There are very few developers that aren't fluent in C# or Java or another C derived language. The learning curve for Rust is pretty steep, since the deterministic memory management requires new concepts to be mastered whereas with C#/Java you can just create objects left and right without having to worry about when to clean them up.

C# and Java have vastly more libraries available to them than Rust.

Having sub-optimal behavior is usually a sign of poor design IMHO. But it's difficult for me to pass judgement without seeing the application code. Also, I doubt that Rust would be of any help in this case.