I have worked remote last 5 years and there is no tool that has truly solved Information asymmetry that remote workers meet every day. How usually organizations solve this is overcommunication and keeping memos from everything but that is a huge time sink and there are always those bad apples that don't keep memos.
yeah, there needs to be something more radical. I think at the moment fully remote teams work better than semi-remote because fully remote teams most communication happens through slack and emails so there is almost always a paper trail.
Once you have a SINGLE full-time remote employee your team should operate as a fully-remote team. That means online meetings, online communications, documentation, etc.
I have toyed tough about some kind text-to-speech bot that would automatically keep searchable memos from every meeting. But I am not sure is the current text-to-speech models there yet.