mumsneedwine interviewees don't get to say what is and isn't discussed at interview. The content of the EPQ may or may not be discussed. When DS1 interviewed at Oxford for Medicine his mad cow EPQ wasn't mentioned, even though he'd had to declare it on his list of pending qualifications, so the tutors knew he'd done it. They were far more interested in throwing difficult graphs at him and asking off the wall questions about history. It's a myth that it's good as something to discuss in depth. It's no better or worse than any book mentioned on a personal statement. It is however absolutely brilliant for providing a qualification at state schools with minimum teacher input. Win, win - until you dig a little deeper. In any personal statement you can flip in mention of things you might like to discuss. That's the art of a personal statement. In fact possibly better not to wax too lyrical about any one particular project or you can bet your bottom dollar that the tutors will pick on something else to explore. Also, very often, nothing which has featured in a personal statement is picked up at all, in any interview. Colleges and subjects vary hugely on this.
Also, I'd quarrel with your point about difficulty: in 2019 (so not a CAG year), out of 57 students at our school taking the EPQ, 43 were awarded an A after external moderation, 10 an A and 4 a B. No student scored lower. It is very, very easy to get an A if you're even remotely organised.