This is being framed as a bad thing, but it is a good thing.

Something going on in the country as the status quo, and someone wants to take it to the supreme court. Without discretion, the court has to take up the case. That means they have to set precedent. Precedent is something you don't want to overturn often, because it erodes legitimacy pf the court to do so. And courts make mistakes. You want as few of those mistakes to either become rock solid precedent or get overturned later. So, they have discretion to take up cases, if something's not that consequential in the moment, why shake up the rules we govern ourselves by and change it, or set it in stone? Wait until it is consequential. And the court can only do that if it can use discretion on raking the case in the first place.