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"I must be missing something. The receiver is female threaded and the barrel tenon is male threaded. Is the receiver not threaded deeply enough to accept the tenon? "
The relatively course threads of the barrel tenon are not precise enough to set head space reliably.
AFTER the barrel is screwed in tight the final chamber cut is made to get an accurate chamber with correct headspace.
There ARE a few guns with hard stops for barrel depth (think Panda actions and such).
They can have a correctly cut barrel simply screwed on (I can call Kelbly's with the serial number of my action and have a new barrel in a week or two usually).
The barrels rub about $500+ each.
Precision and repeatability do not come cheap.
The lack of a hard stop on most actions means the final barrel depth in the action varies.
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