This year one of my pre-season activities was to chop up some LW sticks, make some amsteel chains, and put some EWO double steps on them in an attempt to try something new. I also bought a mini drill from Mark at Treehopper along with a package of 25 bolts - again, just to try something new.
What did I find out? I can't wait until Saturday when I can head back out into the swamps - with my WEI Stepps. They are the absolute best option for me when used in conjunction with my DIY (CAYG) 3 step aider made with tubular nylon. I carry 5 in a pouch I made; 4 of them gets me to 20+ feet and an extra at the top to have a 2-step platform which is really all I would ever need for any tree less than the diameter of a medicine ball. They are easy to carry, simple to install, safer than any other system I have tried, reliable, and effective.
I replaced the WEI rope with some 1" flat webbing and they are MUCH easier to pack at the end of the hunt because the ropes take up lots of space in my bag.
For what I need them for (answering the OP's question), yes - 2 steps would most likely serve you well as a platform. You'll want to practice the 'knot' to be proficient and also practice putting them at the same height for a platform. That second part can get tricky for me, but if it is off a smidge I don't sweat it too badly.