> But the major players do seem to be happy to replace their C++ code with Rust.

I would be wary of mindlessly referring to appeals to authority like this. Sometimes their rationale is very context sensitive. For example, Microsoft has been behind quite a heavy push for C#, and it wouldn't be wise to use that as an example of C# being preferable to C++. See for example Bun's recent migration to Rust which could be misinterpreted as an example supporting migrating to rust, but under the hood it's far from a success story.