As already said only in the playoffs do they NEED a winner. During the regular season, like football, winners are not needed so ties happen.
The reason for 4 on 4 is to get a game winning goal. That is why the NHL went to 4 on 4 and made it so both teams still get 1 point for the tie win OR lose in overtime. If a team scores in OT, then that team gets 2 points and the losing team still gets 1 point. Now teams actually try to score rather than "protect" the tie to keep their point making the OT more exciting.
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