There are lots of questions of persons describing a target and asking how to do it, without any other information. The target is something very generic as "maximize the sales" or "recognize cars". Moreover, usually authors of these questions has none or near than none knowledge on AI and have not done any first try.
Answers can not be specific due to lack of question concretion, usually they contain only the name of the involved AI area. Worst, an usual answer is "yes, use a NN and train it".
Should this kind of question be closed as off-topic ?
Some recent examples:
it is easy to find more direct ones.