I had this same mindset when starting out; I wouldn’t connect everything immediately because certain platforms weren’t “ready” yet. If I had to make that decision again, I would do the same.
Why connect platforms that have no users or content? Example: If you have a main website and link to your new Twitter which has no tweets, that’s just bad UX. If there’s nothing of value added to you linking your platforms, don’t link it.
Also, I only link platforms that are related to each other. ie. I wouldn’t link something professional like LinkedIn to my social Yelp (Elite) account. For me, it’s not relevant. Do what makes sense to you.