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> One thing I was surprised not to see mentioned here is multiple inheritance.
There's nuance to banning that since implementating multiple interfaces is technically multiple inheritance in C++. So I think I'd agree with you but with an exception for pure-virtual classes.
> Also, while iostream is a bit of a mess, having it be strongly typed means that it's, in my opinion, well worth using over cstdio.
Orthodox C++ would ban this but you can have both printf-style with type safety with https://github.com/fmtlib/fmt
Which inspired C++20's std::format: https://en.cppreference.com/w/cpp/utility/format
Which is also banned by Orthodox C++
You can write your own std::function, too, nor is it the only STL type that can take a capturing lambda (std::packaged_task for example).
A capturing lambda is just a class with an operator(). It's complicated to do what std::function does, but fully possible.
In fact, custom std::function replacements have better lambda support than std::function itself. Such as unique_function in https://github.com/Naios/function2 which can handle non-copyable lambdas.