In my opinion, Mercy should not be nerfed or buffed, she is in an ideal position as a safety net for support players. Over the years, the idea of what it means to be a, ‘Main Support’, has shifted and changed, but Mercy failed to adapt with these changes. Some may still argue that she held onto her title, whilst others may argue that she shifted into an, ‘Off Support’.
Realistically, she is a hybrid of both, having consistent healing and utility. She’s not quite a MS as she doesn’t have enough team sustain, often having to prioritise targets and risk others dying due to your choice. However, she’s neither quite an OS, as others in the category have a more consistent utility, eg. Speed and Discord - Mercy on the other hand, has to hope that whoever she is DBing, will hit their shots to give her utility value.
How is Mercy a safety net?
She is comfortable, reliable and accessible. This doesn’t mean that she is braindead, easy, low skill and etc.
Her entry levels are the most player-friendly out of the support roster and they are mostly straight forward. This means that whilst someone is still learning the game, trying to understand it’s mechanics, the maps, they can provide value due to the consistency of Mercy’s kit.
Her kit is mostly forgiving, and the biggest way that one can mess up is accidentally diving in, or resurrecting at a very bad time. This doesn’t mean that Mercy can be mastered just by playing her once, this means that she is comfortable for users to use whilst they learn about the game. She is a stable in the support roster, with many users that main her, used to main her or will resort to playing her when something doesn’t feel right because of how reliable she can be.
There are depths to her kit and hero, that will set aside new-comers to seasoned players, some of the most obvious being things like her superjump.
My point is, whilst the community may look down on Mercy, she’s is very fundamental to the roster, and allows players to ease into the game, later having the choice to move to other Supports or to stick with her. Messing with Mercy, means that you mess with the flow of Supports - you make them less accessible in a time where a majority of the roster can feel quite unplayable. As much as people like to swear on their entire heritage, that Brig and Moira are braindead and easy - they’re not accessible, they’re not player-friendly. We only think this way, because we know how they work, we have most of the information and knowledge to play them, but they’re far from the image the forum portrays them. Bap and Ana are too confusing when just starting out unless you look into them, but even then, their positioning is very important to them, whereas Mercy is quite forgiving in this way as she has a lot of freedom in her positioning. Lucio and Zen provide more utility than healing, and I’d argue are not the best as starter heroes either.
Mercy is very important to the roster, and messing with her numbers can be very detrimental to her state and the state of the roster.