In short, no, there are none.
Programming is still more a craft than science, so there are no studies/evidence on different programming practices and long term results. Most of the "best practices" out there are specific to languages, opinion based and misleading at best.
The common starting point for people that have turned away from modern C++, OOP, design patterns and the rest is that they are skeptical of dogma and are willing to try different things to find what works best for them and why.
Generally speaking, a modern C++ evangelist is not skeptical of the claims modern C++ and the wider C++/OOP ecosystem make to be the One True Way (TM).
Having said that, something that might help is showing comparisons in Compiler Explorer or benchmarks of a modern C++ implementation vs a simple C one. This will only work, though, if someone is interested in reduced overhead and performance. Most of C++ claims tend to circle around high level concepts and ease of development, and overhead/perf sacrifices being generally acceptable.
My 2 cents.
Programming is still more a craft than science, so there are no studies/evidence on different programming practices and long term results. Most of the "best practices" out there are specific to languages, opinion based and misleading at best.
The common starting point for people that have turned away from modern C++, OOP, design patterns and the rest is that they are skeptical of dogma and are willing to try different things to find what works best for them and why.
Generally speaking, a modern C++ evangelist is not skeptical of the claims modern C++ and the wider C++/OOP ecosystem make to be the One True Way (TM).
Having said that, something that might help is showing comparisons in Compiler Explorer or benchmarks of a modern C++ implementation vs a simple C one. This will only work, though, if someone is interested in reduced overhead and performance. Most of C++ claims tend to circle around high level concepts and ease of development, and overhead/perf sacrifices being generally acceptable.
My 2 cents.