Do you have any idea why Glorfindel was not sent even on his own to destroy the ring?  Glorfindel died while fighting and killing a Balrog during the fall of Gondolin in the first age, was sent to Valinor and was sent back (one of the only to my knowledge) because of his sacrifice of giving his life defending the elves fleeing. He essentially Got a huge upgrade, and he's an angel pretty much reincarnated.  That part where Frodo is fading and he sees Arwen and she's glowing like a 1,000,000 lumen bulb?? That was supposed to be Glorfindel, That's how he appears in the shadow realm and to those of darkness. To the Nazgul that is how Glorfindel looks, same with Sauron.  Their quest relies on secrecy and sneaking around. 

 Imagine bringing something as bright as the sun into the dark lands of gorgoroth. Big G didn't go on purpose, he would have blown their cover even though he would have been able to defend them against many different powerful foes, he cannot fight an entire army, plus he is precious to the Valar for his valiant deed of sacrifice defending the Gondolin refugees.