These article is mainly around valuation and financial. It is definitely a good analysis and made severalgood points. 

However, what it failed to address is the new growth revenue such as Apple Car (yes, this is far fetched but in the pipeline) and other new Apple Products. 

Yes, as a trader, you will buy/ sell frequently and take profits off the table. But as a long term investor, every pullback is a buying opportunity!

I am a long term Apple investor and I am not really bothered by the valuation. I buy on every pullback because I believe Apple is here to stay for the next5-30years.