These are good examples of advantages and disadvantages.
There are some things that you just cannot buy online. For example, the experience of going to the movies with a friend or trying the different flavors of ice cream at Baskin Robins. So I think your conclusion is smart and simple. A good entrepreneur will identify the right mix of online eCommerce and retail depending on the type of business.
With that said, as an entrepreneur, what would be the differences between what is offer online versus what is offered in the store? Why?
How can you expand your online products without having to purchase and maintain additional inventory? (Hint: this is one of the growing trends of ECommerce)