> The one huge advantage of C is its ubiquity - you can use it on the latest shiny computer / OS / compiler as well as some obscure embedded platform with a compiler that hasn't been updated since 2002.

First, for all platforms supported by mainstream compilers, which includes most of embedded systems (from 8 bit to 64 bit), this is not really a concern. You're cross-compiling on your desktop anyway. You'd need to deliberately install and use gcc from the early 1990s, but no one is forcing you. Are you routinely developing software for systems so niche that they aren't even supported by gcc?

But second, the code you write for the desktop is almost never the code you're gonna run in these environments, so why limit yourself across the board? In most embedded environments, especially legacy ones, you won't even have standard libc.