There are several reasons why a blocking cookie query is better than simply displaying a list that the user does not need to decide on to interact with the website.
Previously, it was common to have a list at the top or bottom of the page, which only informed that the page sets cookies, but without a choice to control which cookies are set. This is not enough to comply with the legislation; you must not save data on the device before you have collected consent to this.
Some cookie consent solutions present cookie choices to the visitor in bottom bar. This is clumsy and disturbing for users who do not make a choice. It is also in the website owner's interest to get the consent of which cookies the visitor accepts before interacting with the website – statistics and marketing functions cannot otherwise be activated. It is easier to consider the loss of visitors who only accept the necessary cookies if you know how large that proportion is of all visitors, which is otherwise unknown.