Sometimes I feel people should lose fights if it fits or if its for the benefit of the story.
I'd have had roleplays where my character fought with another and they'd use metagaming nonsense and the fight would drag on and on. They'd predict the attacks and dodge everything. So I always choose the lose option. Is losing that bad though? I find it fun if it fits the story and helps develop my character. I just find it annoying that other people insist on winning all the time.
Battle posts almost end up in the sequence like 1. X shoots attack, 2. C predicts attack and counterattacks, 3. X knew a counterattack would be coming and has laid a trap for it, 4. C instantly spots the trap and avoids it, blablabla.
Some people outright refuse to do anything stupid, have their characters make mistakes or lose fights.
In terms of plot fights, I quite often purposefully make them difficult. If players in one of my roleplays try something dumb and heroic they tend to end up deceased.