It comes to mind that "proactive, planned" is arguably more ego-centric than "reactive", thus more likely fraught with the frustrations of egoism, e.g. agony of over "choice" (for you, know, having/being "free will"), missing the here/now for being mentally lost in modeling/planning future matters.
Spelled out a bit:
Q1: What do you need to do in advance of reactive job events?
A1: Next to nothing, because there's little to do until there's an event to react to.
Q2: What do you need to do in advance of proactive, planned job events?
A2: Model/anticipate the future, keep said mental models alive (see also: mind/memory entropy avoidance), plan for the possibility of varieties of combinations of event components, creating backup and/or "What if the Part D modeling was faulty?" plans - and then probably having to be reactive on various fronts anyway just because our modeling is often ego-biased for how much "proactive, planned" requires imagining being a free-willed self to begin with, etc., etc.
In a way, we're talking the difference between being "here/now" and being "there/then".
So, where/when do you mostly want to be? ;-)