Why where the Teleri Ships Irreplaceable?

[Losthuniel]

even after all the bad things that came about because of him, i still pity Feanor. the bit in the Sil about the darkening of Valinor made me cry *ducks head as people laugh at her* he had faults, and unfortunatly, they were of the worst kind. he loved the Silmarils, (too much) and he wanted to keep them from harm. they were his one great work, and quite frankly, i dont blame him . but he was rather obsessive about them. i can understand wanting to keep them from harm, but he was a little bit maniacal. it was understandable of him to go after Morgoth, seeing as he killed his father, took the Silmarils, and destroyed his house (the last one is an is think)then his temper came out, and he did a stupid thing an swore his oath. and i think that his sons swore it of their own accord, but im no expert.