I'm a little conflicted about the engagement strategy I've seen on medium myself. On one hand, something I love about the platform is what a strong community element there is to it. I think the reciprocity element is how I found a few of my first readers to begin with.
But on the other hand, I've had people tell me before that they put 6+ hours a day into just reading and commenting on others work strictly so they'll be reciprocated in return. I think that's a recipe for burnout. For a while I was trying to put a few hours every single day into reciprocating the people who read my work, but it didn't really feel like anything I could sustain sadly. I don't like devoting 100% of my time to strictly writing, but I think that a 10:1 balance between time spent writing and time spent engaging with others isn't unreasonable truthfully.
But having a jointly owned account might make that side of things a lot easier, so feel free to disregard what I just said lol.