Not having a followed link style in this context degrades the usability of the website because you have to rely on your memory of which links you have followed on the list and which you have yet to see. This is an important and little remembered point in the current interaction design "dark age", as Bruce Tognazzini puts it, and Norman et. al. <a href="https://www.fastcodesign.com/3053406/how-apple-is-giving-des... recently written about</a>.

(It is of course also true that the unfollowed link style is not very clear)