This happens in Zoom as well, without the extra Teams downside of external attendees being 4th class citizens.

> 2. Teams is useful for chat & meetings, but Teams spaces are hugely helpful as document repositories, too, and it's additionally easy to add things like Gantt charts and other enriched content types through add-ins.

This is really simple in demos, but tends towards sharing documents via email again (for external attendees) or growing the channel size massively (for internals who need the documents but aren't obviously needed in the team).