> - put each class into its own header/source file pair (a great way to explode your build times!)
Only if you fail to use binary libraries in the process.
Apparently folks like to explode build times with header only libraries nowadays, as if C and C++ were scripting languages.
> - generally replace all raw pointers with shared_ptr or unique_ptr
Some folks care about safety.
I have written C applications with handles, doing two way conversions between pointers and handles, and I am not talking about Windows 16 memory model.
> - general software patterns like model-view-controller, a great way to turn a handful lines of code into dozens of files with hundreds of lines each
I am old enough to have used Yourdon Structured Method in C applications
> - use exceptions for error handling (although these days this is widely considered a bad idea, but it wasn't always)
Forced return code checks with automatic stack unwinding are still exceptions, even if they look differently.
Also what about setjmp()/longjmp() all over the place?
> - always prefer the C++ stdlib over self-rolled solutions
Overconfidence that everyone knows better than people paid to write compilers usually turns out bad, unless they are actually top developers.
There are plenty of modern best practices for C as well, that is how we try to avoid making a mess out of people think being a portable assembler, and industries rely on MISRA, ISO 26262, and similar for that matter.