So you agree with my statement that to get more consistent with harder jumps you must raise your maximum level of aim to a sufficient degree above the jumps you want to get consistent with. That was really all I wanted to state.
Regarding shitmisses I shall take the bait though:
Shitmisses are mistakes that I wouldn't attribute to skill deficiency but to misses caused by human factors that you can't reasonably claim 100% control over but also not grasp the exact cause, e.g. if a fly distracts you and you miss, it's a flymiss, not a shitmiss. Shitmiss from "shit happened somehow".
One of my favorite shitmisses is
me missing a sliderhead in the outro of Cold Green Eyes when the average difficulty has decreased to something at like 3*.
Would you claim that this is an inconsistent play and that I should work on 3* maps at that bpm to improve my skill at hitting sliders? Certainly not...I believe virtually no amount of practicing patterns like the one I broke on would have been able to guarantee me not missing there and I'm confident that I could FC a 3min 3* of that design at least 9 out of 10 times (unless I fall asleep). While most so called "shitmisses" are arguably a lot more debatable regarding the amount of consistency practice you could do to avoid them, it is unreasonable to completely rule out the existence of shitmisses altogether.
/edit:
Based on the upcoming pp changes I would be so courageous to do the following definition:
A shitmiss is the miss of a single note within the entirety of the beatmap with that single note having a probability of 0 or sufficiently close to 0 (I have seen some say things like 7.43502e-7, stuff like that).
This is the note I broke combo on: