Teams can lose because of groups that ignore objectives and run around unorganized and ignorant, tunnel-visioning on trying to kill things or because of over-reliance on objectives and intentionally avoiding combat, who knew?

Likewise, both methods can still win, but like everything else that depends largely on how the other two teams are playing and react to yours.

In the defense of objectives taking a backseat to farming kills (if done properly), this "strategy" is effective in building-up your team to have multiple Battle Highs and Fevers so that whatever team you encounter, they progressively lose the ability to put up a fight against yours and die noticeably quicker, meaning easy points from kills (and them losing points). Passively watching two opposing teams fight for the free objectives they are ignoring is viable so long as one of them isn't dominating and building-up their team with Battle Highs and Fevers like previously mentioned, because eventually your team will likely either be forced into a confrontation with them and crumble versus their DPS bursting down targets faster than they can be healed or will start to see their team keep up with/overtake your points from objectives purely off kills alone. If both teams are at an equal standstill, you literally can win by doing nothing to them.