I've often wondered if there was a point at which we know "enough". That is to say, any knowledge beyond that point, while perhaps "true" and legitimate, can i

I've often wondered if there was a point at which we know "enough". That is to say, any knowledge beyond that point, while perhaps "true" and legitimate, can in no way influence anything anyone possibly does, has access to, or can base any decision on. In other words, is there a level of knowledge that can't be used for literally anything? Is this that?