Hi I'm new.
To address Jules & Nuli from ~2weeks ago:
I did this on live, somewhere in the timeline of Velious through PoP.
The initial strat was pretty straight forward:
-Fully buffed Air pet (for stuns) + HoT
-Mage Mala and Shm slow during pull
-DoT/Nuke respectively, have the shm drop a root if necessary.
(as a side note: air pet stuns were resisted on live as I remember in this era vs white mobs ~35% until above lvl 60, at which point it didn't make much difference. IIRC the pet spell info had a max lvl below endgame mobs)
We could take out pretty tough mobs as this duo. I think we started Highkeep Humans @ ~28 and carried that and hill giants through to 40. Occasionally we'd run into a spot where I'd need to pet heal, so it's a good idea to keep that up, even if 2boxing (would rather have the most efficient DoT's in game on the mob than burn down all his mana on heals... HoT's do well enough later on, and mage supplement makes it work quite well)
There comes a point, and I've seen other posts outlining strategies regarding pet chaining, while not the worst idea, I found it to be poor yielding at best, though it was my only way to deal with some named mobs. My strategy was more focused on non-casters and Root-Rotting them with my earth pet to supplement shm roots breaking from time or damage, or nuking (I noticed in my early-40's pet tanking wasn't a viable solution for much longer), and DISCIPLINE became very useful as soon as I could get it.
The summoned plate and proc weapons are cool and effective, yes, but in the later game you're not quite tanking with your pet anymore.
As a side note, I also raised up a Bard and a Ranger alongside his Shaman, and I found both to be a ton of fun, Ranger got a lot more fun after I dumped a ton in to AAs, but Bard was pretty cool all along. Bard + Shaman is going to be my duo, once I configure all my windows and get set up, but I always felt safest with Mag/Shm, which is probably easier for 2boxing anyway.
Good luck if you go for it!