I can understand both points of views. Memorising may be easier for those who want an idea of what they want to write about and so they can feel more confident whilst entering the exam. Also they can probably adjust some words on the spot so that they can address the question by doing this. It actually sounds quite appealing actually as they can get in their sophisticated essay (and know they have a sophisticated essay) written but also address the question with some minor changes. Plus they may be able to write faster in the exam and thus not be as stressed. I think the mindset that if you have a prepared essay you cannot answer the question is wrong, because it seems to make sense if you can answer the question on the spot from SCRATCH, you should be able to answer the question with PRE-PREPARED response. It'd just require some smart adjusting - which is up to the student's capabilities to how well they can achieve this. So it's not like one or the other in my mind.
However all that said, I don't generally do this though cuz I'm too lazy to memorise something that long and I feel like adjusting anyways would be the same as answering it on the spot. Also I don't really know how to write a pre-prepared essay that is really good and that would be easily adaptable. Like I feel if I made something awesome, it'd be tailored to a specific question (probably because I think of something awesome as to how well it can answer the question) and the effort taken to re-adapt would be about the same as just directly answering the question. But also I find the effort to have to memorise whole essays (plus writing them before hand) is just not really worth it haha - especially if you end up just scrapping the idea and going with something else (which is a possibility that I'd see myself do haha). Memorising techniques and quotes is easier for me. My main issue is writing within the time limits, especially writing something sophisticated which probably others who memorised would have an edge on me. However I also understand the viewpoint of not-memorising complete essays (as this is me).
My approach personally is probably gonna be (this is my hope at least for these english papers) is to half memorise an essay, basically memorise all the generic stuff. In other words stuff that I know I can/will use despite the question. For example stuff in the introduction such as a brief overall comment on the module, introducing the texts and their types, how they are relevant to society and also having a structure ready for the introduction (e.g. brief comment on nature of module, introduce texts, thesis, brief body points, relevance to society). The stuff inside the brackets that can be memorised before hand (pretty much everything but thesis and body points) I'm going to try to memorise. That is an example for the intro, I'm going to try and do whatever else I can (probably just conclusion - unless there's a line or something that I REALLY want to use lol). Hopefully if I can memorise this and get good at it for all the essays, even just the intro and maybe conclusion that will knock about 1/4 -1/5 of the essay that I have to think about and hopefully reduce the time for each essay (about 7-10 min each) so it should reduce the time significantly. I'm also going to try to memorise some sophisticated vocabulary to throw in as well. So yeah, that plus the regular quotes and techniques I should be good, both in analysis and time... I hope... lol