Why clean /usr/local?

[Joe Marcus Clarke]

It was pointed out on the Tinderbox list that pkg now cleans up 
directories like /usr/local/bin (i.e., removes them) if all ports are 
uninstalled.  This, of course, ticks off TB.

My question is, why remove directories owned by BSD.local.dist?  This is 
a behavior change, and before I go changing TB code, I'd like to get 
some perspective.  Thanks.

Joe

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