I've worn a lot of different cuts over the years and nothing has come close to the trunk for pure everyday wearability. Male trunk underwear sits right in the sweet spot between a brief and a boxer brief. It's got enough coverage to stay comfortable through a full day, enough structure to keep things in place, and it doesn't bunch up under jeans or work pants. Once you find the right pair, you wonder why you ever bothered with anything else.
From my experience, male trunk underwear works because it's versatile. It handles a gym session, a day at the desk, and a night out without complaint. The cut sits higher on the thigh than a boxer brief, which means no riding up and no bunching when you're moving around. I think a lot of blokes stick with boxers out of habit when a trunk would genuinely suit them better. It's one of those small upgrades that makes a noticeable difference.
I had a mate who was dead set against anything fitted. He was a boxers-only bloke for years. He finally tried male trunk underwear after I kept banging on about it, and within a week he'd bought 3 more pairs. He said the lack of bunching during his commute alone was worth it. That's the thing about trunks. Once you feel the difference, there's no going back to something that spends all day riding up on you.
What I think makes male trunk underwear the go-to for most Australian blokes is that it doesn't try to be anything it's not. It's practical, it's comfortable, and it works with pretty much every body type. Barramundies does a great version of the trunk cut in fabrics that hold up through real use. If you've been on the fence about trying them, I'd say stop overthinking it and just give them a go.