Difference Between Tag Scope and Search Filter

[MaxSupernova]

Hi folks. I wrote up my observations on Tag Scope and Search Filters here:

http://forums.wolflair.com/showthread.php?t=48878

and I didn't get any commentary.

After playing around some more with tags and getting deeper into data entry and using the Almanac, I'd like to ask for some opinions/official comment on "What's up with Tag Scope and Search Filters?"

They seem to be just slightly different versions of each other that have only a few differing features. There doesn't seem to me to be sufficient difference in function to justify two separate features.

What exactly is the specific purpose of each that the other couldn't do with a minor tweak? I feel like I'm missing something big here...