The clock is part of the game in competitive chess. Those who recommend you don't play blitz chess do not seem to recognise that a person can win on time in any standard time control (here, live chess).
JbSkaggs was right to say that getting your opponent to think too much is a skill. You should strive to make your opponent's day as difficult as possible by making each move a challenge!
If your opponent starts rushing his moves early in the game, you should be especially vigilant to make sure he's not missing something.
The clock is part of the game, learn to use it to your benefit!
The part i bolded seems to be taken out of context. The people that recommend not playing blitz are the people that are suggesting long play games to improve chess calculating ability and vision.
The clock is part of the game in competitive chess. Those who recommend you don't play blitz chess do not seem to recognise that a person can win on time in any standard time control (here, live chess).
Absolutely you can; it's merely somewhat more limited. For example, with a decent size increment you never have to worry about losing a position like Queen and 4 pawns vs 5 pawns, no matter how long the game drags on. With zero increment though, the losing side only has to hold out long enough to win on time, and if the winning side only has a few seconds left, the amount of moves he can make before losing will be limited.
Indeed though, time is always an important factor.