Some great points there.
I have multiple goals here.
Goal #1 is to demonstrate how Rust can be effective at data science / analytics and evangelize a bit.
Goal #2 is to have fun trying to build some of this myself and improve my skills as a software engineer.
Goal #3 (getting a little more vague now) is to ensure that in some hypothetical future I can get a job working with Rust instead of JVM/Apache Spark.