Your question still hints at a false dichotomy between either "meeting the minimum requirements" or "writing in an interesting style". You are in effect suggesting that the reason to write in a straightforward style is because one does not really need to care about writing a good SoP, and conversely if you care about writing a good SoP, you need to distinguish yourself in terms of "interesting style". This is not true.
Moreover, that such a statement makes the applicant more memorable in a positive way, which does aid in the application process.
No, it does not. If you draw a beautiful, detailed, artistic picture of an elephant at the end of your SoP, this will certainly make you more memorable in a positive way, but it will not help you one bit with the application process. This is because while the reader might be greatly pleased by your pictures, your ability to draw beautiful pictures of elephants is entirely irrelevant to what the committee is looking for in a candidate. Now replace "picture of an elephant" with "literary style" and you have your answer.
Caring about writing a good SoP does not mean trying to amuse the supposedly bored reader with fancy stylistics, it means gathering as much evidence as you can for the proposition that you will thrive in their PhD programme and then communicating it as clearly as you can.
You can also think of it as follows. If the person reading your SoP likes your "literary style", they might get some pleasure out of it but it is not going to help your case that you are a good candidate for them to consider. if the person reading your SoP does not like your "literary style" and thinks "I am not interested in watching someone flex their literary muscles instead of giving me the information that I am looking for", it is going to hurt your application.
There is an adage that "good style is invisible". I would strongly urge you to aim for good style in this sense, rather than for "literary style" or "memorable" style. Your question sort of suggests that you believe that an invisible style is either boring or at least it is evidence that the writer does not care enough about the task at hand to distinguish themselves in terms of their style. In reality, it's quite the opposite: accomplishing an invisible, clear, unobstructive style is often the result of much work (and it's a safe bet to assume that the committee knows this too).