I wouldn't agree with that. Default trust is fine for newbies, but after spending some time on the forum you know who you would trust and who you wouldn't. There are several people who aren't on DT/are being actively excluded from DT who I would trust more than some DT members.
This is exactly why you should fine tune your trust settings to include these people that are on the untrusted list by default. If you think they are trustworthy in the first place, and agree with their ratings then it only makes sense to add them.