The units need something supreme to make them usable as naturally being ranged is no longer a feat thanks to lower stats and generally lower damage.
talking about bows:
Lyn is exceptionally for being 3 movement with good damage and speed, exclipsing even non-calv units in offense.
Hinoka has extra damage vs armoured units and fliers so her low def is mitigated if she can kill them in one blow. Many fliers are fast but she ironically outspeeds them and the fast fliers generally don't use DC. Only tanky wyverns can hold on but they are usually increadly weak to magic (beruka/michalis)
Mages: they need to be exceptionally strong to be useful (reinhardt) or again, specific niche(michaiah one shots armoured units). A plain mage like cecilia or sonya without blades lack the flexibility or damage output to really cement them in a team. This is just due to how fast the game is (deleting a unit is far better than war of attrition).