Depends on how highly you value your privacy. Ads aren't just annoying visually, they contain little tracker bits spying on you.

Long before I had an adblocker, I developed "banner blindness", the real benefit my adblocker gives me is less info leaking out to the platforms. (and since ublock/umatrix is so great, also more security and better loading times, but these are cherries)

If that counts as a "practical purpose" is up to you.