Forgive me for drifting slightly off topic, but I think you have just observed and summarized a problem with current leaders in general, and not just NR leaders — the lack of variety between different leaders in a faction.
Every SY leader provides coins / reduces costs as a significant component of its ability. 4 of 7 ST leaders generate another card and 5 involve boosting unit’s strength in some fashion. In Skellige, 4 of 7 leaders primarily damage opposing units. Of the remaining 3 SK leaders, one (Ursine ritual) has no value outside a very narrow archetype, and another (Battle Trance) has—as far as I can tell— almost no use at all. NG is a little better, but even there, 5 of 7 abilities either steal or lock abilities of your opponent. Only in MO is there good variety in leaders — and there the cards are often not effective enough to support most of the leaders.
