Failure at stock frequencies on running a real-world application is a big deal.
I am glad you said that.
If the numbers generated from my NEON FFT functions on Pi3B, which differ from the numbers being generated by 4 other ARMv7 boards, and the same code running on Pi2B are any indication, it looks as if you are going to have a bigger problem on your hands than people moaning about CPU temps and throttling......
First thing tomorrow morning, I will ask the company I work for, for permission to share my code, which isn't open source, with PiF, because this is a serious issue, and this isn't a synthetic test measuring cpu speed or designed to stress a CPU. It is a real world app, transcoding audio from one format, sample rate, (or both), to another.