Gotta agree with this analysis, even as a Fnatic fan i feel that these factors made the most impact:

1) Derke's weird trap in Art
2) Rounds lost because they kept hitting B-Long without a viper
3) The decision to commit to holding Halls in B
4) Boasters many failed lurks
5) The whiffs (not that many but enough to make a difference)

These were more important factors that contributed to their loss than the shields.

But still tho, why not buy full shields when you can? It's like they were saving money because they were expecting to lose each round.