[veli_joza]

I would think so too. Everybody recommends finding a teacher (and a good one at that), but that's not possible for many people. Most people don't have access to good teacher, money to pay one, or enough time for scheduled lessons. Should they give up playing altogether? Even video courses are not good enough because they don't critique your technique or offer suggestions on how to improve playing at your level.

All the apps I've seen are terribly non-musical. They take small part of music (ear training, sight reading, repetition of phrases) and make you train in isolation. I would like to see an app that teaches music in context of music. Show me a concept in isolation (for example minor triad, or ii-V-I progression, or triplets), then play me some actual music examples, then allow me to exercise what I learned with some accompaniment and correct my mistakes. Such app AFAIK doesn't exist.