Plurality still plays a role even in Con Mons in terms of the impact of the existence or lack of social and political reforms. This is separate from the political impact of plurality on elections and changing governments.
As plurality rises, the impact of the reforms at their various stages grows. Their base level is reached when plurality reaches 50, and then above 50 it grows as a ratio, so that at 60 plurality the POP experiences 1.2x the base level of constant +/- MIL growth for that reform, and at 100 plurality the impact is 2x. Below 50 and the ratios are less than 1, so 40 plurality produces 0.8x the base rate.
To draw from an example :
This is the impact of having good healthcare for POPs in a VIP:R game as Britain where pluralty is at 100
If I were to choose this level of reform, my lower class POPs would have a constant -0.20/year MIL decline, while my upper class POPs would have a constant +0.10/year MIL rise.
If my plurality were 50, the levels would have been -0.10 and +0.05 respectively, and increased/decreased further as plurality rose in my society, so if I enacted the reform at 50 plurality, my low class POPs would as the game went along get even more MIL reduction as plurality rose, making them more sedate, while the Upper Class POPs would have gained MIL as the game went along.