For doing open world/rares in new area’s and also delves fresh 80 t4>t11) and very good progressing class for m+ and raiding (maybe good in pvp?) no hunter/warlock/paladin or fdk (have tried them all and not connecting well with me)
I’m willing to bet you could kill every rare at the same time with obr on any class no? 
Hunter is fun in m+
BM and Surv are not low apm according to simcraft
If this hasn’t been already known, Ret Pally seems like a strong candidate. Maybe Frost mage, but realistically abilities should be in constant use so.
Elemental Shamans seem like they would be a strong candidate as well.
Ret and Ele shaman are also high apm classes ;(
I think aug has a pretty slow rotation and loses the least from OBA in PVE. In PVP Blitz games I’ve had more than a few groups talking about how they are very dangerous if ignored. (I have only seen 1 aug in the 120 or so matches of Blitz, so they don’t seem that popular).
For the other slow specs, I would put devastation evoker and feral druid.
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The best (least worst, really) according to community tests was Augmentation Evoker, but it’s weak in groups now and generally frowned upon. The second after that was Destruction Warlock.
I was looking @ feral i do love their gameplay experience <3
Just roll a paladin if you don’t want to put forth any effort.
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Again Ret Pally is high apm so no
High APM doesn’t matter if you use OBR or are just doing world content. Stoo being ridiculous and just say you want to be lazy.
I think destro warlock performs the best with OBR
Also yeah if you’re using OBR you don’t need to worry about your APM because it’ll be 25% slower than everyone else.
I also said raiding/m+ and that high apm and cant play due to carpal tunnel syndrome
Hunter is more fun with 1 button rather than 2 ?
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I second this. Destro is very fun, effective, and simple. Unless you have a disability with your hands or something similar, I even doubt you’d need OBO. You can do well enough with a generic rotation of like 5 buttons, 7 if you include cooldowns. The rest are used so infrequently they’re clickable, (like Heathstone well, summoning demons, etc.)
I had a friend who managed to get it down to Four. Though it was not optimal and she took the passive Havoc. So, there’s that.
Demonology is also pretty slow IMO, and not a ton of buttons, especially in a basic spec. It’s also quite powerful, though has ramp up. Demonology Warlock is what I cleared T11 delves with previously. BM Hunter wasn’t even that good. lol
Either way, good luck on finding something that fits! 
Edit: Nvm, just saw that you included Warlock in your OP as a non-option. 
Well darn. Sorry.
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My sympathies, carpal tunnel sucks. Though, I think at least as anything combat based goes…WoW is just not the game to be playing if you’re looking for low APM. I mean, even with OBR, you can’t really widdle the core game down to the point where you’re pressing 1 combat button every 10 seconds and then just auto-attacking the rest of the time
Yeah i have 671 demo lock and kinda enjoying it but fustrating in delves in t8
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Ret Polly is not a good class/spec for one button. It relies too much on dealing lower damage while using your healing and damage blocking spells to stay alive.
Those things don’t generally show up on the one button stuff.
That being said, there is nothing complicated about it. Blast away and if your health is getting low heal yourself.
How hard is that?
I play mm mb i shoulda said that
I haven’t played S3 delves yet, but I hear they’re harder, so fair enough.
I do remember having to use Health Funnel in T8+ last season to the point that I bound it to a key, though. I didn’t expect to have to do that for some reason, and occasionally things can def get scary. lol
So if you can do more than just OBO, I would def put Health Funnel on either an easy-to-hit key, or easy-to-click space, since I don’t think OBO will ever use it.