Essay assistance is exactly the type of coursework help which students at all levels can benefit from. There is no question of such essay assistance infringing any academic codes of conduct. It would of course be totally wrong for academic writing to depend on outside help such as ghosting or plagiarism and strict standards govern the type of essay assistance which can be legitimately offered.
As any writer will know they are not the best person to look for any errors or omissions in their work. Read it through certainly pick up some obvious mistakes of course. However being too close to your writing is one of the reasons that book editors exist and of course the same applies to essay writing.
Once upon a time everything was made by hand. Each item had to be crafted individually; it took forever because there was no standardization. When Man grasped the concept of using patterns templates and molds to mass-produce identical parts for later assembly manufacturing efficiency took a great leap forward. Whether making furniture or automobiles once people had assembled the first model building additional copies was a piece of cake. They could be certain that the parts would fit together.