On the flip side, if your opponent is about to finish the game with a win or is very likely to on their next turn, I would consider it polite to allow them to do so rather than immediately resign.
I consider it polite to immediately resign. Basically, if you don't, it's because you're hoping that your opponent somehow doesn't see the forced win (which is fine, but not particularly polite), or it's because you're not paying enough attention yourself to see that the opponent has the forced win (which is fine, but not particularly polite), or it's because you're wasting everyone's time (which is rude).
Or because you understand that some people think it's fun to actually get to run past the finish line to make the win.
That's the thing, I don't understand why anyone would think it's fun to click on buttons with no purpose.
I think ever saying that it's rude to not resign is completely uncool.
Different people want different things.
Just because you want to hurry up and get on to the next game, doesn't mean your opponent does.
Isn't the purpose to have fun?
Is it only fun when you're winning?
Also, saying that it's impolite not to see when the game is immediately winnable is elitist boasting.
If your opponent isn't that good at tracking the game state, they are deliberately wasting your time?
Wow.
I didn't say half of those things.
It's fine to not resign if you think your opponent might misplay. It's fine to not resign if you haven't realized the game is already over. If you're sure your opponent has the win and that he is also aware of it, then the only thing you're accomplishing by not resigning is wasting everyone's time, and I don't see how it's uncool to say that wasting everyone's time is rude.
The purpose is to have fun. Trying to win is fun (regardless of the actual outcome of the game; although I can also understand the reasons why some people think winning is more fun than losing), that's why people play games. It's not fun when I can't try to win. I can't try to win when I've already won, so that's not fun, and I can't try to win when I've already lost, so that's not fun either.
I did not say that it's impolite to not see when the game is immediately winnable. Being able to see it has absolutely nothing to do with politeness, i.e. it is "fine, but not particularly polite". I most certainly did not say that not tracking the game state is deliberately wasting my time I said that not tracking the game state can be one potential reason to not resign, and deliberately wasting my time is another, and they don't have anything to do with each other and that's why they are separate reasons.
Actually, I don't even think it's reasonable to demand that your opponent pays any attention to the game at all during your turn.
Imagine there's a trebuchet-building contest. It's down to you and one other contestant, and right before you're actually tested on how far your trebuchets can shoot and how much damage they can do, your opponent just says "Ah, fuck it, yours is better than mine, just take the damn prize." You've won, but it's rather disappointing. Even if your winning is a foregone conclusion, you still want to shoot the trebuchet.
I've seen how many Provinces I can buy with $8 and one buy thousands of times. It's not particularly exciting.