so i don't do it, but my close friend does. essentially your 'major work' seems to be very time-consuming and tedious, and the hsc test is really weird... it's essentially all the weird things in science, like the validity, accuracy, precision, analysing data etc. tbh unless you REALLY love that kind of thing i don't see any benefit in taking it.
on the other hand, if you do any histories, you should consider taking history extension - super easy to b6, super fun, very 'state-rankable' subject imo