Ashe is a crit adc, gets no damage from storm razors and lost some of her damage with the new IE not giving that 1.5 multiplier anymore.
BotRK lacks too much damage versus a stormrazor where the first hit is like a truck vs percentage health damage combined with small base damage makes it weaker then stormrazors and early the life steal is not enough to offset the damage gap. The active item ability might help, but other then that stormrazors outclasses it by far early to mid game
BotRK just has relevance to what is left of the tank meta.
BF Sword into Zeal item is non-viable to me, much better to rush a Blood Thirster then Zeal item now since more sustain and the extra crit does not mean much when its a difference between 30% and 15% crit, since ashe shows the difference in crits best here
IE + Zeal + 100 AD = 180 + (10+30%) = 252 damage with same attack speed and you get like 30% true damage yay (in early game where it does not mean much yet)
BT + Zeal + 100 AD = 180 + (10+15%) = 225 damage which is what like 27 ad less, so yes you got no true damage but low level armor is so low its negligable and the 20% life steal will make a difference in exchanges, Go IE vs BT when you only have a zeal and see how far you get.
new IE is only viable as third or forth item now and for doubling up crit to hit 100%
Stormrazors is in no way a trap, the damage and attack speed it gives makes it relative not to mention the speed boost, though Trinity Force could perform those same things more reliably the thing that makes stormrazor strong is its price, make it more expensive and see if it still runs off as a main early game item.
Trinity Force is far superior with health and that nuke on attack that can still stack on top of crit damage as well and yes you can build a nuke ADC if you run Stormrazors and Trinity Force with a Nightfall and Static Shiv, try it if you want, Stormrazors is just cheap for what it does, it is not a trap unless you engage in games that reach full build it is value purchase