Removing of the navtrees seems like a really stupid idea at first,
but now, as you think it more carefully -> all the areas will
not be raped as often as they used to. Areas nearby batcity will
be fsck:d more than ever, but those which are miles away will be
more likely completely at your disposal. Before you could do
hit&runs to all the areas you know to check whether they're wiped or
not. Now as you cannot check that so easily, it is more likely that the
area a) has not been wiped b) has already reseted from the previous
wipeout.
I don't see that as such a bad thing afterall...
(but then again, I'm not a minmaxer...)