Do they have bots that specifically identifies those posts like filtering a thread to find worth quality post to merit?
No bots.
Study how to get chicken to come closer to you by giving them corn. Don't focus so much on getting merits, just be natural and enjoy what you are doing like fun.
If you want to get the lady you desire, you don't show much interest in her, just be friendly and she will come running after you. At least I have heard this strategy many times.
I am curious because I see posts that is more qualified for merits but ignored while lower quality posts at being merited or could it also mean there is favouritism in there?
More qualified because of volume but no content or contribution made. Lower quality because of meaningful lines that are precise, direct to the issue at hand and probably helping out.
There is difference between quantity and quality. Focus on your strong points and skill. You must not be tech inclined to post something meaningful.