Markets with imperfect information are less efficient. If everyone knew which products were shit, then yeah, warrantees do take away freedom. But by providing a floor on product quality, consumers are freed from needing to do a large amount of research to determine which products will last (research, which, might I add, is still imperfect. Even the best products have defects protected by warrantees).

Also, warrantees force companies to bear the full cost of their negative externalities. In lots of markets, companies will come out ahead by not fixing or replacing your product (brand damage < actual damage), so those businesses are motivated directly into misleading consumers into buying worse products. Sounds obvious, but clearly that's not good for a society in the long run.

looks like there is a dark side to the word freedom.

How do you mean?

freedom to do bad things.