The "problem" is that Nintendo consoles usually have a decent amount third party titles, but they a) tend to be of niche genres b) most Western Nintendo consume

The "problem" is that Nintendo consoles usually have a decent amount third party titles, but they a) tend to be of niche genres b) most Western Nintendo consumers specifically buy their consoles for the first party titles c) either Nintendo or the publisher does a poor job of marketing them in the West (because of a and b).