Why does one need a fance build system? I just use "make" or compile all.

When you need to create and distribute self-contained executables for multiple OS that bundles dependencies (and their dependencies, and their dependencies, and resolves conflicts between all of them). In Rust and Go it's simple ... like 'cargo build' or 'go build' and everything is handled. What are you doing? Treading through a hellscape of jar, javac, and god forbid maven or gradle commands and tons of XML files?

Why did you link to JNDI? I replaced Log4j.

Because most java programs use Log4j, and since that JNDI change in 2013, most of those programs were left wide open to remote code execution. This got exploited in the wild at a massive scale. How pathetic... a logging package led to countless people and enterprises getting hacked... java is a piece of shit.

Rust looks really horrible to me. No garbage collection, for example. Also see this.

No garbage collection is a feature IMO. It's just faster. Also the language makes it easy to get rid of your resources, like automatically dropping locks or running destructors when you exit a closure, etc. (This is the Drop trait in Rust)