I see there are tags "recommendation" and "recommender-system".
My question for discussion is:
Is this on purpose? If not, should we merge them into one, let's say "recommender-system"?
There are 92 questions tagged with "recommendation".
There are 59 questions tagged with "recommender-system".
There are 12 questions tagged with both.
I didn't read all questions, but at first glance it looks to me that there is almost no difference in thematics of questions tagged with these two tags.
I am aware of almost the same question from 2014: Should the recommendation tag be burninated?.