It's every players right to play the position to the end, if they like. The one thing that I think is very bad sportsmanship is when the opponent just sits there and lets their time run out. That is complete discourtesy. Now, I admit, there are endgame positions where it seems dumb that they play on, like when I have 2 queens in the board, and plenty of time left on the clock, and I'm thinking of ways to slowly torture them, lol, but it's still their absolute fair right to play to the end.
Statistics on the ways to lose
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A player who gets into a losing position has 3 options:
3) forces the opponent to wait and do nothing for the remaining time of the loser. 2) forces the opponent to actually play the moves forcing the checkmate.
It is said that grandmasters have the courtesy to resign when they realize they would lose, rather than waste their own and opponents´ time by checkmate or loss on time. Yet an original grandmaster Sämisch played tournaments where he lost all games on time!
As a winner, which would you prefer your opponent to do, assuming he does not resign? Make you mate him, or make you wait out his time?
Is there any actual statistics about recorded games as to which is more common - checkmate, or loss on time?