So, part of the Stack Exchange philosophy is that the question should suggest clear criteria for judging an answer, and ought to be relevant to a real problem the poster is experiencing.
With system recommendation questions, this means specifying what you actually want pretty tightly instead of just casting a wide net that will just lead to everyone just posting their own pet favorites. Because lists are boring while answers to questions are awesome.
But that does mean the question is pretty specific to that poster. What should we do when someone else has similar general requirements but different specific requirements?
Take a look at this question, for example:
This is a reasonable question as written. It specifies details relevant to what the poster wants, such as "combat-focused" and "low-prop." These are very important for making sure that the original asker's problem is actually addressed.
Say I find this question by searching for "system for LOTR." What if my criteria don't match the original ones?
Let's say I don't want a combat-focused system (violates OP's requirements), or don't care about system complexity (violates OP's requirements), or really want a system designed for short-form play (not mentioned in the OP's requirements).
Should I ask a new question, also called "What is a good system to play LOTR?" (Will that be closed as a duplicate?) Am I basically out of luck?