I don't believe you.
This is a joke right?
"Team LF DPS" means the team is looking for a way to increase their combined DPS. Clearly they are looking for a high DPS archetype/build. Similarly it makes sense to advertise your aggressive Stalker/Scrapper/Corruptor/Blaster as DPS if you want to find a team where you can help out as effectively as possible.
In what situation would a team want DPS but not want a blaster? That makes no sense ever.