DT is not intended to actually be 'default' for most users who are actually trading on the forum. Forum members are encouraged to curate their own trust lists, and network to include ratings that are the most useful to them.

Being in your trust network (or on DT if you have no trust list) is only meant to affect how trust ratings are displayed. It is not meant to highlight someone's posts, or to signify that someone is more knowledgeable than others.