A lot of the devs left Kbin due to the on-man-leadership problem and started their own fork Mbin which has been progressing more quickly. A lot of instances have moved to Mbin, including kbin.run which I am on. Either way, it is performing very well overall and does enable interaction with both Lemmy and Mastodon instances. I check Lemmy instances directly periodically and don't see any advantage to returning when Mbin lets me interact with more content.