Hoyoverse has taken an approach where they are launching niche elemental support characters like Gorou or single stat-boosting characters like Yun Jin. This can be an excellent approach to building your team if you want to focus on a set of characters that can benefit from a supporting character. At the same time, this may limit team comp options because, in the case of Yun Jin, you cannot work with more than a few characters. Not all characters will use her regular attack DMG buff, and overall, support characters like Bennett will outclass Yun Jin there. To get extra damage, you cannot swap out a character who can boost your attack and heal simultaneously.