I think this keeps things open because if they can see your stuff but cannot comment or repost it served the purpose, in fact it will lessen the chance that per

I think this keeps things open because if they can see your stuff but cannot comment or repost it served the purpose, in fact it will lessen the chance that person needs to switch accounts because they can already do half the things(see post) without switching. If they have to switch accounts to look at your posts, they will also surely be easy to comment and repost your tweets to their mobs. This is overall plus