I suspect some losses in translation taking place. First let me try to repeat Leoreth in other words:
No, that's not quite how it works. For a respawn to happen most (but not all) cities need to be held by civilizations that are sufficiently unstable, but once the respawn happens your stability does not matter for determining which cities become part of the respawn.
Translation: If
you control all cities in a civ's specified Birth Area and
maintain sufficient stability, the respawn won't proc.
This would mean you can never take any cities in any other civilizations core.
No, it means you need to leverage other means of maintaining sufficient stability so that respawn conditions can't be met. To work with your example, you'd have the option to control
all of China's core yourself to at least eliminate the variable of another civ's stability influencing the likelihood of a respawn. Yes, there will be a price to pay in the Expansion column, likely a hefty one. You are
challenged to compensate in the other columns (Economy, Domestic, etc).
Version #2: This forum is full of players who have won Japan UHV games. There is no "never".
With the current respawn criteria you may loose them at any time because the civ respawns.
See above. Also see the Pedia. *At any time* is not the case. There are specific conditions.
They game becomes unplayable when you are trying accomplish UHVs where you need to conquer cities in other civs cores.
If it's possible to express the sentiment that one might #GetGuud most politely I aspire to someday find it. For real for real from the bottom of my heart this is the certified Reddit definition of a #SkillIssue
Version #2 Again: This forum is full of players who have accomplished UHVs where you need to conquer cities in other civs core area. The game is playable.
You can design a game which is historically accurate or a game where someone actually plays it.
And you can pay for it.
Hot Take - Blizzard Style: You don't *want* what you propose. Leoreth's crafted this infernal machine carefully and lovingly over like 10 goshdarn years now at least in concert with we proud citizens to such an exalted point where we can't even remember when or if any fundamental design problems existed. The
challenge factors, aka Why We Game, are already established. The only Shop Talk taking place here concerns fine tuning and fussy fan punch lists.
TLDR;
UHV Japan - credit to
@Logoncal