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.
Another aspect of essay writing which can be overlooked is that of presentation. The handwritten essay of previous centuries has largely been consigned to history. This certainly creates a level playing field for all academic writing to be presented neatly and legibly. However not all academic writing skills extend to a good knowledge of one of the standard word processing programs such as Microsoft Word. This is another area for essay services to provide coursework help.
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.