Regarding most (or many) of the port changes--say, upgrading
        foo-2.1.9_5 to foo-2.1.9_6, if  the upgrade could be done by
        downloading a binary diff file, could the resulting
        /usr/local/bin/foo-2.1.9_6 be achieved by downloading a
        relatively small binary patch?  Seems to me that smaller scale
        upgrades could be done this way in preference to re-compiling
        ports or downloading entire pacakes.  --Same would go for any

        Why is this a bad idea!

because if you change say 5 lines in program source of 1MB binary program, resulting new 1MB binary will be MUCH different byte-by-byte mostly because of address shifting so lots of pointers to code (or data, rodata) will change. so diff will be big.

recompiling is OK anyway, because you always recompile to your machine (assuming you set CPUTYPE in make.conf)
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