that's where communication and collaboration strategies and procedures exist. It can be really easy to have them be mindless things, rather than mindful things. You can use your medium of communication, whether text, ad-hoc calls, or so on. No need to schedule meetings unless both parties are booked for ad-hoc chats
With some examples
* Hey, I was chatting with X a bit ago, couple things came up about service A and B. Got some time for a quick call?
* Hey, I can use a sanity check with this brainstorming session, got any time free? Oh, is Junior X available too?
Not saying your points aren't valid. But the same things would also happen if I were at my desk and you were off talking somewhere. How would you get me into the conversation?
The big difference is mindfulness, I think. Remote communication requires more mindfulness about team and communication, whereas in office you can be really lazy about that.
At the end of the day, its about communication and collaboration, and making sure loops are closed. Reasons for unclosed loops exist, regardless which environment you're in