The choice of a pure-monolithic kernel is also interesting; I can buy that it's more secure, but having to recompile the kernel every time you change hardware sounds like it would be pretty tedious. Early days, though, so we'll see how that decision works out.
Why would you need to recompile if hardware changes? Linux manages just fine as a monolithic kernel that ships with support for many devices in the same kernel build.
A monolithic kernel and resource locators that automatically mount network drives? That's just macOS.
(You don't have to recompile the kernel if you put all the device drivers in it, just keep the object files around and relink it.)
Incremental compilation makes that a lot less heavyweight than you would think and the idea is to automate the process so the average non-technical user doesn't need to know or care how it works.
Why would you buy it’s more secure. Traditionally in windows in-kernel compositing was a constant source of security vulnerabilities. Sure rust may help the obvious memory corruption possibilities but I’m not convinced.