Not only would this be useful for the anxious players in the community, pro players have complained that match visibility in the career tab is revealing too much information about scrims (see: Hiko's patch 1.11 video).

From a personal standpoint, I get overly anxious having my career tab public to others, especially when there are oddly confrontational people who are constantly leering at your performance to make offhanded remarks. If I was able to make it private, it would allay any of my concerns. Obviously, this is quite a trivial issue and I should iron out the problem myself, but alas it is an adequate anecdotal example. I think it would be quite nice to cater to those with poorer self-esteem!