Here are my unscientific observations based on the repointing project... Opinions only
Plastic tips seem to have been developed to prevent point deformation of cartridges in the magazine after the first shot. This then caught on as they are pretty sexy looking and caught on with shooters
Plastic tips are simple to form and incorporate into bullet forming. They are very light and my opinion is that they contribute very little to bullet weight or stability considerations.
Plastic tips are very uniform thus bullet to bullet bc should be very consistent.
Plastic tips are relatively blunt thus bc will be lower than if the same weight hollow point bullet had a meplat diameter of 0.025"
The the repointing project trims the jacket back a specific amount, removes the plastic stub and inserts a brass tip with a meplate less than 0.030" and a weight of around 11 grains with a significant increase in overall length length.
The final bullet weight is increased a few tenths under 10 grains.
BC is increased by a published and real world tested just under 0.500 to a calculated estimate 0.660. Field testing is sporadically underway with definite indications of significant bc increase.
Out of my 8 twist barrel @ 3500 MV stability doesn't appear to be an issue.
However, process tolerances definitely make a difference.
Here's a pic to feed your mind processing a bit.
The 159.8 grain repointed bullet compared to the 150 Ballistic Tip and a 195 grain Wildcat.