It might seem small, but it's a big step in the right direction. Every block/report on a user/tweets could be rolled up and adjust a spam/abuse score for that user. That would allow twitter users to set a threshold for users that show up in their feed (tweets blocked for that user, akin to google's safe search).

One challenge of this is attempts by groups to harm a user's score by blocking/reporting non-hate/spam. This requires a block or report to be weighted by the blocker/reporter's credibility. It's definitely doable, * Warning Shameless plug* a product I've worked on https://www.inversoft.com/products/profanity-filter handles these situations well. Without some type of credibility tracking it's usually incorrect to blindly trust reports/blocks.