I voted for it being a 'good' strategy, however that is not to say it is the best, undoubtedly it is a solid starting block (as your playing the best hands).

However this is exactly what it is a 'start', my worry is that some (obviously not all) will get crazy wrapped up in this and then their own learning might suffer, as a result- by not 'seeing what works for them' in another way--> not sure if that makes sense- but i just mean that you might lose out by not experimenting yourself... just a thought. As said- solid starting point.

I would say that the next stage on from the 19 hands is position- in my view this is the single most important factor in poker- knowing when to raise based on the players behind you actions, then in co-ordination with position i think: betting patterns/ reads is next...