yeah some nations need to castle their corelands .
man is such an example .
a jotun/ulm pd is more worth their money .
but i play with the "rule" : castle your base territory before you run into other players , that are about 15-25 castles depending on map , early game expansion speed etc.
then when i expand only castle key provinces first , and castle every province where you want to build a temple first .
if i have time i castle everything but at least my homelands .
lategame the best bet to get rid of "raiders" like the birds is to wipe them out by ghost riders .
imho in the long run the nations which don't need too much resources for their troops , e.g. vanheim , mictlan , pythium , arco .... have a advantage because everything is castled .
the others have the real huge disadvantage that 1-2 ghostriders can wipe out most p.d. + garrison troops .
5/10 deathgems for -200 gold for temple , - 200-300 for pd , some lost garrison troops etc. is normally totally worth it while it has no effect on castled provinces .
i think we can really abolish clam hoarding / mad castling now