So the first reddit links provides a very dubious calculation based on some Javascript calculator that's on some random website. And the second link discusses Scrypt as key-deriviation function, where it provides considerable benefits over other function. But as proof-of-work requirements are considerable different from key-derivation requirements those benefits don't really apply to Litecoin.
LTC serves as a hedge against any issues with BTC, both in terms of bugs with the software and any sort of attack on the network.
Bugs with the software? Litecoin isn't some new software, but just an outdated Bitcoin client. Look at the source code.