This is STILL relevant! I left Google Plus and it was quite a sad transition. G+ turned a messy random feed into an organized little blog that is fun for users to explore.
Here on Steemit, whatever you post is fed into 1 single stream. A cooking post precedes a crypto post.. then a video game post. On G+, the collections let you organize "alike posts" so that users who visit your page can click on the collection they like most. That is a VERY attractive feature. This should be PRIORITY ONE on Steemit's roadmap! I hate having this messy random feed uhgggggg!!!