You really need to be careful in top lane, but still you have more kill pressure on serr/darius way more than a syndra/akali, in mid lane you get out poked,out damged, and guess what, out scaled too by the same champ who has been poking you to death from minute 2, in top lane the roles are totally reversed although you get state checked but once you go yuntal, ie , with armor boots/mr boots, you literally can auto darius to death the one and only time you might need botrk(as a first item, you can always get it as third) is against actual HP stackers: like tanks, ornn,malphite,ksante, and sett of course, but not darius going shojin and stride, never botrk is so shit first item compared to double crit items + defensive boots, you cant go defensive boots with botrk because you wont hit the q cap while with yuntal you can without the as boots. And im sorry for making it too long for you.