Why there is a difference between Router and PIX ACL

Hi,
I have a very basic question about the differences beween ACL behaviour in PIX and Router.
In Router if we put an extended acl entry and want to remove an mid entry then either we have to clear the entire ACL or remove the entries all the below.
Whereas in case of PIX we can remove any of the entry.
Why this difference is there.
Would appreciate your quick answers.
Thanks
Irshad

The PIX OS is designed such a way. Anyway, even in routers you can remove a mid entry by configuring named access-lists. You need not clear the entire ACL in this case.
ip access-list extended ROUTER-ACL
permit ip host x.x.x.x host y.y.y.y any

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