Juz a simple question...
What happened after you missed or nearly missed that shot.
It could be for whatever reason like subject moving too fast or people obstructing you.... or even stupid mistakes like panning into someone's head.
Would you muddel it in your head over and over again and think that better equipments would help you clinch that shot or would you just forgo such shots and forget that "incident"?
Let me start with myself.
I had a 5700 and the AF sux BIG time for keeping up with kids and can barely focus in resturants. So I tot a DSLR would be better.
Got my 10D+28-135+550EX, I've since got much more acceptable shots, but still now hate the shadow cast in portraits orientation. So I tot getting a flash bracket and Off-shoe cord.... and the list of wanting tot get that shot by getting that "suitable" equipment.
note... it's not for the lack of deliverables, rather feeling fustrated that you just missed capturing something....
now I'm feeling that my 550EX cannot keep up with my shooting.