I use RCC++ daily as part of my development routine, and although you can introduce problems which mean you need to relaunch the program, the fact that you save having to do so most of the time is a big win for iteration.
For instance your crash protection catches execution failures, but what about data failures? If you've got a write-past on an object nothing is going to be keeping you from destroying the rest of the world(unless all allocations in a hot-reload scenario are constrained to separate pages that you can protect?).
Seems like a lot if things you're trying to avoid by catching crashes are built-in to Rust.
So there may be benefits to using Rust, but the issues you've posed are not ones I've found were my primary concerns when working on code which needs fast development iteration.