Well it's in the public domain now so the answer is more apparent ??s
The kinetic strike was binned in favour of a cyber strike at Iranian military capability. A smart move it might be said - no civilian casualties, no opportunity for the Iranian regime to reignite the 'great Western Satan' tag line...
It's been a long journey since WWII (and before) where bombs and bullets have been the ultimate fall back for failed diplomacy and there have been some truly horrific situations since the Manhattan Project - napalm and carpet bombing in Vietnam right through to depleted uranium in Iraq (and that's just the (so called) 'conventional' weapons deployed by Western powers - there is a whole other can of unpleasantness when you consider the 'non conventional' weapons of 'lesser' (?) states and regimes.
In a rather perverse interpretation, I suppose one could refer to the 'progression' to smart munitions, drones and cruise missiles, and greater appreciation and consideration of the law of armed conflict (as relates to the potential for civilian casualties) as a step forward from the past.
As has been highlighted in this and the other thread, it can in hindsight (and yes, it is hindsight) be recognised that previous foreign policy which may have reverted to kinetic warfare has had a detrimental outcome - especially when juxtaposed with poorly considered immigration policies which have facilitated hostile communities within the initiating nation state.
For all those that see Trump as a fool, I'd suggest his latest operational strike demonstrates an awareness of previous failures and a willingness to embrace, what might well be considered, the future of military intervention after failed diplomacy.
The tradition spheres of military operations Land, Air and Maritime have new play mates - Space, Cyber and PsyOps.
It would appear that the West has been playing catch-up in these new realms - consider, the recent NHS cyber attack, Russian interference in overseas political processes, Anonymous cyber attack on ISIS to name but a few.
So that provides (at least) 2 fundamental changes of attitude the start of which, it might be seen as being delivered by Trump (the fool?) - 1 recognising and implementing the change from kinetic to cyber ops by nation states and 2, recognising that non nation state players can be just (or more) effective than nation states in the delivery of effect.
The PsyOps element is also interesting. Do you go public and state what you've done to hurt your 'enemy' or do you just keep it on the QT so that only 'they' and 'you' know what has been done.
Trump - maybe personality driven, but I think not in the Iranian case, has now gone public. Contrast, the (suspected) Russian interference with other nation state political / democratic processes, no overt admission of involvement.
Interesting times ahead - It's my view that the US response to the Iranian situation may prove to be a lot cleverererer than a lot of people give Trump credit for - right enough it's not all down to him, but he is the Commander in Chief and it IS his decision which path to take once the smart guys have presented the options to him.
Maybe not such as dumb ass as some would have you think...