I do not get it. In one hand you guys do not understand why people want keep iOS 6 on their older devices and call everyone to update to latest and greatest OS even though it will run slow on older devices. Then you guys also do not understand why people complain slowness when they do update. You guys complain in both ways, makes me wonder the only right way is forcing everyone buy the latest and greatest iPhone or iPad....
Actually, as any one with a normal understanding would have figured out by now.... most ones who complain and moan are the ones left behind with older iOS! The rest have moved forward!
Now the comment you are quoting is aimed to someone who was expecting full featured latest iOS to run with it's full power on a 4 year old device! Guess what? Not in this universe! It would only happen when a 90 years old grandma completes a full marathon run.