I concur with dtrue's rant. Going beyond that, hi-hats can be a central part to the personality of the beat. If you think of how a person moves and walks, the kick would be the feet/step, the snar/clap would be the hands, but the high-hats, I think of the state of mind the person is in, maybe even some hip and headnod movement. For instance, if the high hat is just quantized 1/8th, it's pretty standard, normal guy walking/thinking.
16th's is a little anxiety or rush, with purpose.
Now if the hi hat is just like on the even beats, and not hitting the same time as the kick, it's kind of like a pimp walk. Like o=kick, x=snar and .=hi-hat o.x.o.x.
but since you want to tell a story through a song, you want to switch up the personality or motion, so you do a roll to accent the end of the 8th bar or go into the chorus, as it'd be sort of like a welling up of feeling that's been portrayed previously in time, like . . ................
so you could think of using the high-hat as sort of like what mentality of the mood. Stiff, rushed, hurried, chill, wacky, it depends on the relationships between the kick, snar, and hat, how they interact with each other, between playing together on the same beat to adjacent beats to having their own space in the beat; the beat meaning like 8ths/16ths, not the whole drum track.
Another thing that fits with the person walking analogy, is the kick is typically in the low to mid area just like the legs. The snare is in the mid to highs, like the hands, and the hats upper mids to upper highs, like the head.
Also, I've gotten into the habit of straight up hi-pass filtering hats maybe around 4k. I didn't think that would work because I thought it would take away from the attack, especially if it's actually the stick hitting the hat, but that hasn't been a problem, and it really opens up more space in the mids.
A song has more personality when the hats get switched up or compliment other musical and vocal accents instead of just staying on 8ths or 16ths the whole time. Experiment with 2 bars going from tiplet 8th to 8th to triplet 16th to 16th. A little swing can go a long way...
Also, depending on the hat, you could just use a open hat for both the closed and open high hat. you just automate in simpler or sampler a mix between the decay/sustain/release times and you can get a natural roll of the high hat goingfrom very closed to very open (old skool newb trick)
And don't forget to use the fucking velocity.