Plenty of tools don't require recompiling anything for profiling. Running the program once for profiling seems like it should be less work than running and interrupting it 10 times (heck, a lot of tools won't even require restarting the program if it already happens to be running). Visualizing the output by function or by something more fine-grained should be a matter of a single command. And if it's easier to manually find the hotspots by looking at a bunch of stacktraces than the profiler output, there's something badly wrong with said output.

Now, I'm sure there are special circumstances where this method is the right thing. But that's totally different from it apparently being suggested as best practice to newbies.