> Web browsers have been written in restricted subsets of C/C++ with significant additional tooling for decades at this point

So, written in C/C++? It seems to me you're trying to make a point that reality doesn't agree with but you stubbornly keep pushing it.

> So, written in C/C++?

Not in the sense that people who are advocating writing new code in C/C++ generally mean. If someone is advocating following the same development process as Chrome does, then that's a defensible position. But if someone is advocating developing in C/C++ without any feature restrictions or additional tooling and arguing "it's fine because Chrome uses C/C++", no, it isn't.