"My 'caprice' comment was basically referring to futile kamikaze attacks"
Do you play chess? There's an old saying that the threat is greater than the execution. Obviously someone who is reduced to actually making the kamikaze attack is doomed regardless, but that's a failure of diplomacy, because the person who can make the kamikaze attack should have used that fact to negotiate with the person who's pressuring him towards that extremity and get into the draw. Again, the idea that giving someone the kamikaze option reduces his options is absurd.
In PPSC, there's no incentive to stop attacking because the attacker is getting big (good if there's a solo) and narrowing the draw (good if there's no solo), and isn't worried about the small power's kingmaking abilities because there isn't much point in being the king.
"Do you have any evidence or arguments for why eliminations are more common in PPSC vs. WTA games?"
I make no claims on that scale. For all I know, WTA players get eliminated more because PPSC players don't know how to play the game, or vice versa.
"Right. Moreover, the given scenario with two Great Powers which dominate the board which is used to criticize PPSC scoring suggests that minor Great Powers face an inevitable solo from two directions."
Nope. The whole point of the criticism is when the solo is not tactically inevitable but the incentives make it inevitable. Really, there's no such thing as a solo that's inevitable from two directions.
"From a points-incentive perspective, those diplomatic options in a WTA scoring system don't hold the weight they do in a PPSC scoring system because simply holding territory is no guarantee of any points reward in WTA scoring whereas holding territory is a guarantee of points reward in PPSC scoring."
Are you for real? Holding territory is no guarantee of point rewards in WTA only if there's a solo threat. A solo threat outweighing mere point count is a *good thing* and does *not* make holding territory irrelevant, as territory confers the power to (a) become a solo threat and (b) survive draw-whittling.
"my most recent game"
I'll get back to this when I can see more than the final board state.