Quote History Quoted: I agree children have a shorter attention span and varying levels of maturity.
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They also usually have eyesight better than most of us can remember having.
I see starting a new shooter out with iron sights is like teaching someone to drive on a manual transmission. Some people can learn to drive on an automatic then become proficient on a manual, but there is a larger population who never bother or who never become natural at it.
A front and rear sight is still the dominant set up on pistols, and on rifles they can encourage a repeatability of position, so I can see solid reasons for including them in someone's introduction to shooting.
I do agree that one can't sit a 10 year old on a line shooting scored targets for hours. I've seen target variety make a big difference. Potato chips stand out against earth and don't need to be picked up later.