As a web developer I haven't found any reason to use Rust yet but I have delved into it recently and I really love the language despite it being frustrating at times. Hoping Lambda supports Rust natively at some point so I can actually use it!
It'll be interesting to see how the golang lambda implementation is done, as i could see it being a backdoor into supporting any statically linked binary so long as it fits whatever constraints they need.
[1]: https://github.com/sambaiz/puppeteer-lambda-starter-kit