It is naive to categorise students into maths/science/logical thinking and English/creative thinking. There are students who are both, and there are students who lack both. But the point remains that we all speak and write English, and therefore it is far more appropriate to make English mandatory than make maths or science mandatory. The typical response to that is to make English non-mandatory, but in my experience and observations, English does provide skills that would otherwise not be obtained through the maths and sciences, based on the current syllabi. I see too often Engineering students lacking a certain sophistication in their report writing or even essays (yes, there are essays in engineering). Of course they would have done English, but I suspect they did not really care about it. There are also other factors such as scaling for the ATAR, for which HSC English is the control to scale all other subjects.
Now, sure there may be a lot of regurgitating but all that still needs to be written in a manner which supports an argument or expresses in a different format than standard everyday speech. Creative thinking has a lot to do with Science and Engineering. To communicate ideas in a way that people will listen and hopefully invest money in requires creativity and articulation which is something HSC English aims to provide, believe it or not. To be able to formulate arguments to support a thesis or point of view is not found in HSC Maths or HSC Science, but in my experience, it is found in the Humanities. Interpreting a text is only one aspect of HSC English. It is how you convey your interpretation which is far more important, and at the end of the day, that is what's being marked - your written response.
Having said that, I was indifferent to HSC English since I did a few humanities subjects as well. Appreciating HSC English and being a maths/science person are not mutually exclusive. I personally think the subject could incorporate a larger focus on arguments and debate, report writing, logic and philosophy, and rhetoric. HSC English has been brutally distorted by how it is approached, a sort of mechanical aspect whereby you are given a text and the output is an essay, then repeat. The subject itself needs to be more creative.