There are accretion models which operate off high pressure, low pressure and both. I choose both. You cannot ignore high or low pressure during stellar evolution.
J. Marvin Herndon has a lot of material to discuss, for this example I introduce only one aspect and will overview more in future talks.
1. J. Marvin Herdon's (incomplete, high pressure to low pressure only)
2. Establishment's (nonsense, low pressure only)
3. Stellar Metamorphosis (complete, low to high to low again)