These days, almost all the restaurants have commercial dishwashers for washing dishes, but it does not bring an end to the work of a dishwasher. A dishwasher still needs to place the rack in and out of the commercial dishwashers. And even before that, most of the dishes need a pre-rinsing or pre-scrubbing so that the commercial dishwasher can clean them properly without leaving any stain.
Also, the commercial dishwashers do not have enough space for large pots and pans, and you have to wash them yourself. For best working of a commercial dishwasher, you must keep all the leftover food particles to get inside it as it will block the drainage system of a dishwasher and it will not clean the dishes anymore.
So, even after the inclusion of commercial dishwashers in restaurants, a dishwasher expert is required and has quite an important job.