"Hard to learn" ? Google found that when they trained engineers to write Rust the majority of engineers reported they were confident writing Rust in 2 months or less and a third reported they felt not merely confident but as productive as in other languages in that time. Google describes this as "in line" with numbers for other languages they've taught their engineers so apparently it's not especially "Hard to learn" compared to other languages used at Google.

https://opensource.googleblog.com/2023/06/rust-fact-vs-ficti...