Rust biggest weakness: it needs a strong ecosystem of libraries. This ecosystem is fragmenting over time.

Sylvain recommends however four use cases for Rust:

• rewriting from C/C++ to Rust
• optimizing and securing the icome if the development can take two
• passionate that are already Rust experts and who are not counting their hours
• while starting a compagny that will vertically integarte a lot of different systems, from embedded devices to web services, i.e. https://oxide.computer/

That being said, if Rust may not be the best choice to build servers, Rust shines every time you would have picked C if it didn't exist such as crafting shellcodes and building other security tools.