A short intro
When teaching a feature I'm always trying to bring the minimal example that is still a good one in terms of best practices. I'm trying to avoid minimal examples that are convincing but rely on bad practice that might be adopted by the students.

now to concepts
One of the minimal first examples that can be given with concepts is:
void foo(std::integral auto number) { /* */ }
As a substitute for:
void foo(long number) { /* */ }
But then I'm a bit reluctant. Is it really a proper substitute? The two are not the same. What are the pros and cons of having a template function, avoiding type conversion, compared to a simple function? Is it a good example or a misuse? In which cases this is a good substitute? 

I tried to raise this question in SO but didn't get much support for it:

This is not a yes/no question - I do believe things might be a pro in one case and a con in another. Analyzing the pros and cons for different use cases can surely assist in understanding the proper choice per each case.
As a teacher I believe this is important, even if not discussed in class, to understand the pros and cons.
(If there are only pros than the example becomes a new "best practice". And if there are only cons it becomes an "anti-pattern". I think above is neither, it probably has good and bad use cases which worth understanding).

Would appreciate your thoughts (on the specific matter, as well as opinions on understanding pros and cons as a teaching requisite, i.e. is this a relevant question in your opinion).