The main purpose of the merit system is to avoid very low quality posts and topics
No: The main purpose of the merit system is to
reward and encourage good posts. Why is everybody focusing on the implicitly consequential negative, rather than the explicit primary positive?
sometimes I rely on the posts that gets merits from
achow101.
Good idea; so do I. Then, perhaps you should rely on my post as to which you replied. Look above.
In Development & Technical Discussion, I also suggest that you should watch posts awarded merit by
DannyHamilton. If you are a learner, follow his own posts, too: He excels both at providing good information, and tearing apart misinformation.
There are other expert users whose merit endorsement should tell you that a post is meritorious on technical grounds; but I think those are the most consistently active. Merit is somewhat transitive; thus if you see that a particular user is
often awarded merit by somebody whose technical judgment you trust, then merit awarded by that user should be a good guide, too.
As such, consider Dev & Tech merits to function as a
de facto peer review and reputational system.