I rarely edit my default trust list.
Same for me

Quick question: Do small members like us needs to know, or pay heeds to DT systems? Afaik it doesn't benefits those who aren't that much established in this forum. I don't see any usecase or positive or negative impact for us, at this moment. But for reputable member like you, it does matter. Am I correct it any way?

That's like saying voting in the national elections doesn't matter, because your vote is just one in so many million. It's kinda true, but if everyone else thinks like that too, the system fails.
You've earned enough Merit for your Trust inclusions to mean something:
- You must have at least 10 people directly trusting you each with an earned merit of at least 10, not including merit you yourself sent. These "votes" are
limited.
- You must have at least 2 people directly trusting you with an earned merit of at least 250, not including merit you yourself sent. These "votes" are
limited.
Based on how the system
should be used, users should only be included if they left good feedback and have a good Trust list. If users never leave feedback, they should never be included (even though it happens). So even if your feedback doesn't show up by default, leaving feedback when you think it's appropriate is a way to
start using the Trust system.