The one problem I see with keeping forests is that I have now grown into the cautionary habit of chopping any forest directly adjacent to the city (that is the 8 in the inner square). Sure, sure, plan well etc and there won't be any unassailable enemy stacks fortifying in there, but then suddenly there is one anyway and you wish you had chopped
. Except for tundra, as having something useful to work is worth the risk.
