Don't forget your skin has normal flora that can fight off bacteria such a propionibacterium, that's one of the leading causers of acne. Once you find a routine that has been working for weeks, best not to introduce new things onto your skin that can mess up the normal flora protecting you.
Many of the things here are acidic which prevent the growth of a lot of acne causing bacteria.
Yes, I agree. We should stick to what works out best for us.