In my case, usually essay writing involves having a thesis statement usually as the beginning sentence, followed by a few general supporting facts or opinions. Subsequent paragraphs will usually break down each of those generalities with supporting interesting details, using more facts, description, opinions with foundation, narrative examples or sound reasoning.
Of course grammar is important, but to be frank I am not going to lose much sleep there with a few minor mistakes as content and what one says and how they say it is far more important to me. I would more quickly tune out a general, one-sided and biased writing or one with just opinion after opinion without argument and supporting details than a piece with facts, details, something interesting and thought-provoking or with sound reasoning.
I am fine with writings that are informative, persuasive, interesting or entertaining, so it does not take much to please me, but too much facts or too much emotion can lead me elsewhere I admit as I am often in the middle there with how I express. I write in many ways like I talk, informing and detailing, with sometimes an analysis.
I also try to have some organization and flow to what I say, with a general purpose in mind,and I try to keep the average listener and reader in mind, if not change up things a bit if a different audience is involved. Usually I want to be as brief as possible, lol, but comprehensive. I mean, be relevant and straight to the point, but thorough to explain my position well so as I am not misunderstood and something is learned.
Most words I choose carefully, but without much thought. Oymoronic it sounds, but it that is very true. I grew up feeling every word spoken or heard could be very important or mean the difference between getting my needs met or being understood, or mean the difference between safety, happiness, being content ,a survival or living peacefully.
Having said all this, each should express in the way they desire, no matter how brief or lengthy, as many will focus on quality for what you say than quantity. Even I am smart enough to know my lengthy writings will not be read my many. But, I do not mind there, as no matter how we express we will not p!ease all, as we all have different triggers, preferences and needs there, and as we express differently.
If everyone wrote and expressed the same it would be boring to me. For instance, I am the type that would internally rebel against any art teacher that told me this is what that art meant or why that art should be appreciated or what that artist was thinking, just as I would tune out an English Literature professor who said that writer, book or poem was great because...
I will determine what I feel is great, enjoyable or readable to me, and that often differs from the masses because my personality, interests, abilities, style and ways of expressing is different. That is why members here too may not read posts from all members, but those they relate to or understand or appreciate the best. I am this same way, as limited time these days on!y allows me to do such.
So, you determine your desired ways of expressing,after realizing we all have rights to express differently there. No textbook or writer is perfect in their presentations there.