It is a challenge to find quality posts from an ignored user but sometimes you can see quality in quoted posts of the user. It is barely seen by you because it needs to depend on quoted posts, not original posts of an ignored user.
The ignored member's posts are not necessarily bad. Often times, members ignore other members who may have high-quality posts but do not like their opinions, so it is not possible to judge an ignored member by saying that all of his posts are not good.
Many reputable members of the forum have different opinions, so it is good to use the ignore button in this case to prevent useless quarrels and arguments between members. Therefore, in my opinion, the ignore button's primary function is to prevent members from seeing the posts of members who do not agree with them or whose opinions they do not like.