I've noticed several instances lately, though I suspect it has always been the case, that someone will give a new answer that adds nothing new. The worst cases are when someone just gives a subset of the recommendations of an earlier answer. The new answer is just a bit of noise. Sometimes it will be ideas from several answers, but still, nothing new.
I wonder if it is desirable and possible to "discourage" such posts without seeming too heavy handed.
One possibility would just be some advice in the help pages. Not every new user seems to get the point that this site isn't just a bunch of discussion threads. That may be related.
We have mechanisms already in voting and comments for people to express agreement with the advice in an existing answer.
Here is an example of this. Another user posted while I was writing. This has happened a couple of times. (Rep needed to see my deleted answer.)