There are two philosophies, but not as you identified them. Rather:

1) Identity based access control: Single (user level) granularity access 
control. Centralized mostly mandatory style of granting. No delegation 
other than true central administration or proxies. 
2) Authorization based access control (capabilities) : Multi granularity 
access control. Decentralized discretionary style of granting and 
delegating.

The problems I have with scenario 1 are:

a- granularity: User level granularity is simply no longer in sync with the 
21th century threat landscape.
b- scalability: Centralized and mandatory access control simply doesn't 
scale across modern day multi-domain environments.


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