A feature of the Messages app that I find absolutely indispensable is the ability to mute individual conversations that I don’t feel like responding to or receiving notifications from. This lets me continue receiving messages and responding to those I want while not being pestered by those that I’ve muted.
As great as this feature is, I’ve found that that missed messages from muted conversations still count against the Messages app’s notification badge count. This means that even if you’re trying to ignore someone in particular, the Messages still serves you with unwanted badge notifications for that specific conversation — and worse — bunches those missed notifications with others from the conversations you actually care about.