I do the same thing. C++’s feature is incredibly broad, and sprinkling in just a bit too much templating can result in code that is cleaner, but harder to reason about when reading it back after a month.

For example, using C++ 20 ranges over simple loops is an example of where brevity and “cleanliness” can reduce clarity because the heavy templating and operator overloading hides what the code actually does.

On the other hand, sometimes one can’t avoid the complexity when writing a library that aims to work on many platforms, and with special tricks such as SIMD, as is present in the Eigen library.