Why does Quora do anything?
At a speculation: several of Quora’s recent UX changes have worked to undermine the social media nature of Quora, which Quora likely feels is inimical to its mission as an expert forum. Removing visibility of upvotes in the feed was clearly one. Removing the “follows you” badge for two weeks was another. Removing MVW listings in profiles was a third.
And this is a fourth: Quora (I’ll guess) does not want you to follow users because of who you follow in common, but only because of the pristine quality of their answers, which you will have carefully evaluated one by one (since you also can’t use a shortcut like MVW as readily).