Is it necessary running the %check section testing reproducibility?

When it comes to testing reproducibility, the primary focus is on ensuring that the build process can be repeated consistently. The %check section does not contribute to this process, as it primarily tests the functionality of builds (and it costs hours sometimes!). Comparing binaries compiled between two builds can be done without running the %check section, which in my opinion, is more efficient. But just in case, I was wondering if there's any must-have check section under any specific package?