The blurb toward the end about Rent/return makes me a bit nervous though. They say they’re not going full borrow checker, but rent at least sounds an awful lot like borrow to me. Details were basically non-existent though.
I guess I wonder what the end game is here though. The more they make C# like Rust with a GC, the less incentive people have to use C# except maybe to support legacy work. I am still far more comfortable in C# than Rust, and I believe C# is superior for e.g. web, but over time this advantage could be lessened quite a bit as the Rust ecosystem continues to grow.
OK, I see a lot of C# code often and over a long time.
I see the "unsafe" keyword used approximately never.
I'm sure that this is useful for some cases. But not everyday things for most of us. If we did use it, it would be carefully isolated in a library for a specific purpose.