One angle I rarely see discussed is how a harem setup can actually diffuse conflict rather than heighten it, which sounds counterintuitive. When you have multiple love interests orbiting the protagonist, the tension often gets spread thin. Instead of one intense, claustrophobic power struggle, you get a bunch of smaller skirmishes over attention and status. The central conflict becomes less about 'will they/won't they' and more about resource management—who gets the MC's time, trust, or a crucial piece of backstory.
That said, some writers use the harem to stage proxy wars between competing value systems. The childhood friend represents comfort and past loyalty, the noblewoman offers political advantage but cold calculation, the rival is all about passionate friction. Their fights over the protagonist are really fights over what kind of life he should lead. The resolution, if there is one, sometimes feels like the MC choosing an identity, not just a partner. I've dropped series where that choice never comes, though—it just becomes a perpetual status quo of mild jealousy.