The first generation iPad does not support iOS 6. As operating systems evolve it’s not surprising that older hardware is obsoleted. AppAdvice on the matter: Get over it. But is that so easy for a publisher of apps made for children? Developers would prefer to deal only with the latest version of an iOS release. However, if you publish apps for children there’s probably a very high percentage of children who have the first generation iPad. As mom and dad upgrade to a newer iPad then that older model gets handed down.
My 1st generation iPad runs 5.1.1. It’s pretty slow at times, especially when there’s a lot of books in iBooks. Movies run great. No problem there. Some apps are slow to start and some are sluggish. But, still, overall it’s a decent device. And for a young kid it’s a great device.
If children are a significant customer segment for your apps, then you’re likely to be supporting iOS 5.x for a long time. With the hardware limitations of the 1st generation iPad Apple probably didn’t have a choice in leaving it out with iOS 6. But for those selling apps in the children’s market it’s not such an easy decision to abandon that model.