This aggro looks weird for me too. If the intention was to make the Swordsmen the ones to get aggro more easily, then they should also make threat skills affect Raid bosses - or at least Peltasta being able to bypass this restriction. This way we could have tanker builds with threat management.
Personally, I don’t think the new skill will fulfill the role they apparently expect (either being with or without one of the attributes), specially with the attributes making it 6s duration only, with 60s cooldown.