More AoEs means bigger mobs which in turn means more drops. If on a team, it means faster clear times. I'm pretty much at the point of skipping on any attack set which has a single AoE. No set needs that many ST attacks. End game attack chains can be 3-4 ST attacks. You sure as hell don't need 6-7. Case in point, non-Stalker Claws can use all of 5 powers to have a ST attack chain and one for AoE. I'm not 100% sure for a Stalker as I refuse to play Claws without Spin, but I still assume the first two attacks won't factor into an end game build in terms of usage so in theory it should still work, but again, I haven't even looked up the numbers.
For those scoring at home, FU, Slash, Focus, Spin, and Shockwave. Even Brutes and Tankers with the longer recharge on Spin can still pull it off. My Scrapper got SBed, and my attack chain was FU and Spin. Mu ha ha ha.