I always used to go in my exams having memorised just quotes and analysis and I never dipped below 18. I understand some people may not be able to write original essays on the spot, but it's so stressful having memorised an essay and finding that your essay doesn't match the question at all. So no, I'm sorry but I have to disagree. All the people who memorised essays in my grade got below band 5 and consistently performed poorly in their assessment tasks.
i agree that it can be stressful to memorise an essay and finding it doesn't match the q at all (this was the case for a few people in my school). but from what i've seen with myself and my peers the ability to adapt is a much easier one to develop and refine in a short amount of time than it is to memorise quotes and practise writing a perfect essay. like for my english practice every few days i'll bring up a random trial/hsc q and practise adapting it (eg. a few days ago i was working on this one q that was really annoying and stressful at first but i ended up writing an essay that fit the q and was fine under 40 min). i also find it a lot harder to just have quotes + analysis because while i have them memorised, i have to spend extra time thinking about where to put them and how to organise it (when i do that in writing my memorised essay), but ofc to each their own.
another factor is feedback - there's no use memorising an essay without getting extensive feedback from a teacher, tutor, etc. when i was writing my essays to memorise for the exams, the essays i ended up using were the result of 5+ drafts because every single time i gave it to someone to mark it was always hammered on and shredded which made me do it again and again until it was something that was actually decent. with both of those factors, people who memorise and end up getting trash is mostly because they don't practise adapting (they only memorise and show up to the exam hoping it turns out all well), and don't get feedback continuously and don't try to continuously improve their responses before the exam
it's no hate towards ur preferred method (i myself did it until y12), but personally (and in the opinion of others) memorising just ends up being better. as long as ur careful though, ofc - you need to put in the effort to make sure you have a good response in the hsc