Let’s say you want to do speech recognition in English and you use this with users in the US. If you model is good enough you will be able to recognize some voices but have big problems recognizing strong accents.
We got a few emails form people living in the South of the US complaining about how current commercial applications are not able to understand their accent really well or at all.
Capturing the accent and encouraging a diverse set of them we can have a strong trained model who is able to recognize more accents than commercial applications.
People can also create models for very specific cases, let’s say your target audience is a region in a specific country and you want you model to be specifically optimized for accents in this region.