I hear you, advanced generics (for complex unions and such) with TypeScript and Rust are honestly unreadable. It's code you spend a day getting right and then no one touches it.

I'm just glad modern languages stopped throwing and catching exceptions at random levels in their call chain. PHP, JavaScript and Java can (not always) have unreadable error handling paths not to mention hardly augmenting the error with any useful information and you're left relying on the stack trace to try to piece together what happened.