My experience is that for non-FBA fulfilled products this doesn't hold at all.
Out of the last ~20 orders (I don't order that often from them, so that's probably spanning the whole last 12 months or more), more often than not, the predicted delivery date has been adjusted upwards, often by ~2 days, and a few times by ~a week.
This may be specific to Germany/Berlin, as from what I hear, they (/ their subcontractors) have troubles finding delivery drivers. Mixed with the growing counterfeit issues, and degrading product description / details for most products, Amazon doesn't seem to be in it's prime.
Out of the last ~20 orders (I don't order that often from them, so that's probably spanning the whole last 12 months or more), more often than not, the predicted delivery date has been adjusted upwards, often by ~2 days, and a few times by ~a week.
This may be specific to Germany/Berlin, as from what I hear, they (/ their subcontractors) have troubles finding delivery drivers. Mixed with the growing counterfeit issues, and degrading product description / details for most products, Amazon doesn't seem to be in it's prime.