EV only takes into consideration a tiny part of variance IMO...
Playing style can def effect it a ton. If you're never shipping stacks in until the river usualy. EV wont bounce up and down that much..
Plus I think i run slightly below, at, or above ev. But there are other ways to runbad,
Example like you flop a set, and get over setted too frequently often (maybe this happens only like once ever X times but its happening to you way way more often). You'l get your $ in always and be way behind. Then all of a sudden after getting in 20 times being a dog in set over set situations, then you bink one or two 1 outers. and boom all of a sudden you're way above ev. Does this mean your running good? not necesarily because it doesnt take into calculation that you're always getting set over setted and having the worst set....
I mean this is all just a stretch. If you run all your set over set scenarios like 1000times then the EV obv will even out. But just an example that EV doesnt mean everything. It could be a good indicator of how your running when you go all in before the River. That's it, it doesnt count anything else.
And how often are you all in? not very often, so it doesn't tell you how you're running overall. probably just a fraction of how you're running. It kind of bugs me as well whenever ppl complain about they run so bad and they're XXX below ev, but in actuality they're running so hot in most other spots.