Hello judgement,
"Currently, if there are 100 cities and I have 55 of them, I know already that I'm going to be able to get all 100: the rest of the game becomes just a tedious exercise in destroying weaker neighbors."
This case is quite different from cleaning up pollution (really tedious), capturing cities from a rival is much more interesting. A lot have to be done before and after a rival city is captured. Competing with the rest and trying to be the strongest is challenging and beating weaker rival (by capturing all his cities, bullying) is as interesting. Except when the rival has one or few cities left (no more resist)
Again I would strongly suggest to remove/reduce the effect of "mechanisms to counter the snowball effect" when the choice of player is to win only by "Conquer victory". There isn't a way to determine "WHEN" is the best time to allow snowball effect to take over.
Your idea:
"I should be required to continue to play smart and pay attention to what I'm doing in order to increase my share of cities to 80 or 90. Only once I get that high should it become very obvious that I will win, and the snowball takes over and makes getting the last few cities quite easy"
is not much different from no snowball effect at all throughout the whole game and is contradicting with your opinion:
"Once you are the biggest and most advanced nation by any significant amount, you're pretty much guaranteed victory. To some extent, this is a natural part of the game, and a good one: if success doesn't lead to more success, what's the point of trying to succeed?"
"Currently, if there are 100 cities and I have 55 of them, I know already that I'm going to be able to get all 100: the rest of the game becomes just a tedious exercise in destroying weaker neighbors."
This case is quite different from cleaning up pollution (really tedious), capturing cities from a rival is much more interesting. A lot have to be done before and after a rival city is captured. Competing with the rest and trying to be the strongest is challenging and beating weaker rival (by capturing all his cities, bullying) is as interesting. Except when the rival has one or few cities left (no more resist)
Again I would strongly suggest to remove/reduce the effect of "mechanisms to counter the snowball effect" when the choice of player is to win only by "Conquer victory". There isn't a way to determine "WHEN" is the best time to allow snowball effect to take over.
Your idea:
"I should be required to continue to play smart and pay attention to what I'm doing in order to increase my share of cities to 80 or 90. Only once I get that high should it become very obvious that I will win, and the snowball takes over and makes getting the last few cities quite easy"
is not much different from no snowball effect at all throughout the whole game and is contradicting with your opinion:
"Once you are the biggest and most advanced nation by any significant amount, you're pretty much guaranteed victory. To some extent, this is a natural part of the game, and a good one: if success doesn't lead to more success, what's the point of trying to succeed?"