If they are DOT approved, then the supplier has gone through the process to have the DOT certify the product and they would be able to put the yellow "DOT" tags on them. I think it's just paperwork. As long as the lines are tested and quality made, I don't see an issue with non DOT approved lines.
We can't run standard brake lines because you need to have a 3AN end on one side to use the NPT to 3AN fitting the Wilwood caliper comes with. An alternative is to rethread the hole on the caliper to accept the banjo connection, but I didn't want to do this. The WRX lines are 14 in. long, so they are way too long for the Legacy.