Shared mutating state. Really the parent and everyone here is just complaining about this one singular problem and how no language has completely solved it yet

Shared mutating state. Really the parent and everyone here is just complaining about this one singular problem and how no language has completely solved it yet with a method that's Easy and safe. If my comment was the parent you’re referring to, that isn’t really my position at all. Certainly there are challenges that come with shared mutable state, but we also have some good tools for dealing with those already. There is a more general problem of managing side effects and external resources, where I think there’s room for better language support, so that might be a better example. The biggest single frustration I find with many popular programming languages is that once I’ve figured out how to solve the real world problem we’re dealing with, I want to implement that solution as fast as my mind can think and my fingers can type. I don’t want to get bogged down with wrangling general purpose data structures and algorithms, or wondering how to implement an idea with whatever networking or database or mathematical library we use, or writing a screenful of infrastructure plumbing to talk to a cloud service, or trying to figure out all the possible ways that a function I’m calling might tell me it failed and hand-crafting a few lines of boilerplate for every single one. I haven’t found a language and ecosystem yet that I feel give me that, even though I’ve found many features in reasonably well-known languages and libraries and tools that individually make good progress in that direction.