First I want to thanks kinke dedicated his personal time into this great project, without LDC the D language is a pure toy.
I guess D is a risk choice back to few years ago, now there is too much choice with much bigger ecosystem. I guess the demand for LDC from company is reduced.
IMHO, LLVM Coroutines with async/await is important for Network/IO programming. Even basic support only for betterC will make a big different. But there is no manpower and resource to start this in the next few years. (C++/C#/Rust/Go/Javascript all have async/await), I know there is fake one with fiber, this is not the same thing compare to C++.
Beside async/await, the most wanted feature is trait/ownership/match from RUST. The cool kid dont deal with class/interface anymore.
I recall some time again Alex said we need support Vibed as high priority, but after years vibed/hunt web framework are not popular yet.
There is DFL/dlangui/dwt/gtkd for UI, all stoped except GTKD(linux only). You can checkout a lot cool GUI project from RUST.
There is some project for blockchain, non of them success to be able provide funds to the community.
D claim self as system programming language, I dont know what this meaning. You want java level memory safe with GC, that will never been accept by OS kernel.