Well, it’s bigger discussion I guess, about product feature, however sometimes new features don’t mean better experience.
In my opinion it’s always good to allow user to craft one’s own experience - users who collaborate can use these features, users who don’t - are not distracted.
Let’s see Todoist for example. They allow collaboration features only if I invite someone to the project. I don’t have “assign to” button if I’m alone. It might sounds like its a nitpick, but it’s actually increasing cognitive load (“why should I like my own card”? “what is the difference between pin and like”)
Of course I understand the business model and you like to promote collaboration and make app more popular… But I believe in the end I will more likely recommend app if I literally l-o-v-e it, than if I’m propted to in navigation bar tab all the time (which I will never use)
Of course this is my opinion and I’m curious how other think.
But from both developer’s and productivity freak’s point of view (who also develops products), I vote for some feature flags in settings 
I don’t think its major though - I rather think of future features and which direction app will go.
I have personal struggle if I should move my “second brain” here, which will cost me a lot of time, still not being sure what direction it will go. I have experience with tools who went into collaboration seriously and made me quit.
Anyway for now I like how it looks and look forward for the future releases
cheers