you can rely to kill only on DPS with a full DEX archer, but it is better to stay on a common killing build. By DPS'ing then piercing a mob, you can hit another mob to kill it. If you have a decent gear, you should be able to finish the mob before (or shortly after ) DPS kills the another mob. By this you have gained two times XP in one time span.
my archer is a STR/DEX/LUC hybrid. In early phases, i used STR/DEX before i restatted. In pando, it might be difficult to kite with two mobs, but if you invest into blunt too ( it becomes AoE after lvl4 ) you can lower their accuracy once they are both close of you.
it is viable ofc, but i still suggest for a common killing build that you can kill twice faster