Think im being dumb here. What can these new spin to win skills proc?
Things like passives from necro/nightblade wont do anything right?
Do devotion skills proc off them?
If they don’t proc much, is it better just to use blitz/leap skills instead and then use a default weapon attack skill?
I think I have confused myself and overthought it a bit 
It is not a default attack replacer
it can still proc other things like devotion skills etc
That’s the most stupid question I’ve ever read, but it’s hard to call you “dumb”. Look at Bone Harvest for example. Now look at “Spin2Win”, or Eye of Reckoning (that’s the same skill if someone doesn’t know). Now look at Forcewave. Look at “Spin2Win” now. Look at Flames of Ignaffar. Take a look at Callidor’s Tempest. Look at Fire Strike. Now, at last, look at Primal Strike or Doom Bolt.
Now you’ll ask “what the fuck does this idiot USER_NAME_01 mean???”. The answer is simple, all those skills do the same thing. If they’re the same, how come THEY’RE NOT ACTUALLY THE SAME? - you’ll ask. Another simple answer, every skill I listed has damage, only the type varies, all have Weapon Damage (Doom Bolt has it too if you get appropriate items), all have range or cooldown, or no cooldown, all modify your character’s movement, because they trigger an animation, all have their range in which they hurt enemies.
So what is the difference between all those skills? No difference at all. This should answer your question, because if everything the skills do is the same, they work the same way. 
I have only played summoners, seeing a skill that hits multiple times per second, with weapon damage, made me wonder what it can proc.
Honestly I find your reply a bit mean, you could have just answered it in a simple way, I know im being dumb, I literally said so myself. I have not played around with skills like this much.
As Abuser_bane_666 replied, there are many many skills that have the same “feature” that can proc “everything”
What you can’t proc are the weapon pool skills like smite, shattering smash, markovian advatange, etc since EoR is not a default attack replacer (default attack replacers have that property written in orange)
Ok thank you
I actually didn’t mean to be mean, but every time I try not to be mean I end up fucking it up. 
Anyway, if you think about what I’ve wrote, you’ll understand that I basically meant to compare skills that do the same. If you play summoners, and you use, let’s say, Briarthorn and Hellhound, you know they’re basically the same pets, but have different stats. They do the same things etc, so if you used at least one of the skills I listed, you’ll get the point I was trying to make, it works the same.
If you want, I can actually abuse YOU.