Moving the kernel to modern C

C let’s you do whatever you want. C++ is more restrictive than C. As I’ve said, the decisions made in the 1990s made sense then, but they don’t anymore. People who make the most performant, high security code code in C++ these days. There are no points in this game for being chads programming the way of the ancestors - on the contrary this can be harmful. This is particularly the case where people are reinventing language features using text substitution macros and a set of instructions to be carefully followed. Using the correct subset of C++ for Kernel mode is also a discipline - just as writing the correct type of C code is a discipline (using VLAs can overflow your stack for example, so don’t do it) - one that can be enforced with analysis tools and compiler switches.
It’s OK to say that you don’t want to do it because you don’t know how or are scared to learn new things. But it’s also OK for people to say maybe sheer obstinacy is not a reason to not consider an idea. The cult of personality in this area is not helpful.