This has the added bonus of making you aware of how much algorithmic filler there is!
The x86 protection model is notoriously complex, with four privilege rings, segmentation, paging, call gates, task switches, and virtual 8086 mode. What's interesting from a hardware perspective is how the 386 manages this complexity on a 275,000-transistor budget. The 386 employs a variety of techniques to implement protection: a dedicated PLA for protection checking, a hardware state machine for page table walks, segment and paging caches, and microcode for everything else.
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I'll leave more discussion about this for another post, but I think this is solved by adopting the same philosophy of adding new things and leaving existing ones untouched.