cause most RPGs have either an interesting enough story that you WANT to play it again or is DIFFERENT in some ways that make it playing it again worth the effort neither apply here
Precisely. There’s also some level of challenge at some point in every story mission that players tend to want to play better. Destiny is just about run run jump slide run hold square shoot a few adds run run jump jump slide jump hold square shoot a few adds collect motes hold square kill boss. So linear, so boring.