My point is that even C++ (a language that somewhat-famously lacks built-in support for reflection) has tooling to access and run non-public parts of the progra

My point is that even C++ (a language that somewhat-famously lacks built-in support for reflection) has tooling to access and run non-public parts of the program. "I don't like making functions, methods, and members nonpublic because how would I access them when debugging?" simply isn't a credible complaint when applied to most mainstream languages.