this is a dumb argument from u and hrdevil,
i play realm 50 and after i boxed mu lvl5 fortress no one dares to attack it, coz they cant destroy it for lack of morale, even with no army in it
so its a good way to protect your ressources, army save is very important too, but u cannot say boxing is uneffective
ok dude i was trying to be nice and not to show how foolish your suggestion was..chegewara gave correct suggestion because if dude colonized province 19 he would have to colonize 3 mountains .having 3 mountains in your first few provinces is pretty foolish because of slow population growth.so technically just because of +20% fort hp which wont save you if someone really wants to kill you,you would have to practically have terrible economy for nothing...and yes population growth matters..even in v4a..player who has all plains will develop faster than guy who has 3 mountians because his population will grow faster ergo his production will get bigger no matter that mountains have some bonuses...
regarding your fort 5 in r50.i see last in top 50 has like 40 k points.. fort 5 boxed and full of archers can crush a guy with like 20k points with no problems..so my guess is low on net and you play v4a..easy to say no one will attack your boxed fort when youre surrounded by noobs and goldmines
get in top 50 and see how your boxed fort lvl 5 will hold
P.S sorry that i had to be rude,but this is only effective way to explain it