My intuition tells me this is similar to Solaris/Illumos Doors.

I'm running Sway on FreeBSD daily and it's way snappier and sharper than on any Linux distro I tried. Go ahead, it doesn't hurt.

No. FreeBSD enthusiast will tell you there's no need for something even remotely similar. I love the OS but some of the zealots are the reason for the miniscule size of the community.

Every move in the concurrency direction is good but I really wanted to see preemptive scheduling and Erlang-like processes.

In C++, concepts are essentially generics where templates are more like weird macros.

Idris would be even better.

By that time you would’ve written the code yourself, only better.

I am sure this is partly tongue in cheek, but no, you can’t have written the code yourself in that amount of time. Would the code be better if you wrote it? Probably, depending on your coding skills.

But it would not be faster.

OP is talking about creating an entire project, from scratch, and having it feature complete at the end.

What’s the specific Rust IDE?

There is RustRover from JetBrains.

We've had memory-safe languages for 50 years, don't act like Rust is the first one.

I’m always going to like articles introducing people to FreeBSD.