An LDP-MPLS is deployed on a network and labels are used for packet forwarding. As you may know, LDP needs IGP and there is IGP too. Because there is no RSVP, there is no traffic engineering and there is no bandwidth reservation.
Rather than "locally" looking-up tables which reduces the look-up process load for packet forwarding (and I think this look-up process is no load for today routers), What are other advantages for using LDP-MPLS? In comparison to using just IGP like OSPF for the network.
P.S. This link didn't help.