I feel like everyone likes to think that their job is more creative than it really is - little work really happens in "the kind of spontaneous collaboration and free flow of ideas that many of us took advantage of when working in a shared space with our team.".
I've been involved in many presentations remotely with multiple people on Google Slides and it always ends up a bit of a mess. There's alway someone ignoring the style guide, no one is really sure when a slide is finished, orphaned comments left ignored, etc.
I know this is blaming the tool for the way it is used, but I can't help but feel that the tool is contributing to the problem. In my experience, 9 times out of 10 delegating sections of content with a final edit and sign off by a designated individual would work very well - no real time collaboration needed.