On the contrary: Parker is absolutely meant to appeal to children, and is kept that way on purpose.
Batman worked to earn his skills: detective, fighter, inventor, businessman, philanthropist, the disguise of the bored socialite, all of it, to serve his chosen purpose of being Batman. His psychosis is beside the point. He knows about it and chooses to use it to serve a purpose anyway. He is who who has chosen to be.
Parker was accidentally bitten by a spider, gained powers, and from then until now has done everything possible to avoid making any kind of lasting choice beyond aimlessly whining and moralizing to himself in his head. He's every bit as smart as Richards, T'Challa, Stark, Banner, McCoy, every last one of them...and will not commit to anything beyond simply reacting to life as it comes along to smack him in the face. Have you ever seen Parker train at anything? Work to improve his fighting skills by studying with anyone? Ever? Nope. It's all instinctive/reactive. His skillset has it's appeal visually, and it makes for amazing dynamic graphic art, but make no mistake: the immaturity underlying everything he does is kept at that level with that appeal to the aimless in mind.
The man chooses, the child reacts.
