It's been a few years since I have used WeChat, and I suspect they might have improved their workplace features since then. The desktop app was a thing several years ago, but even then it depended on the right people being added to the right groups. I remember dozens of instances where people would say "oh, well we talked about that the other day" and then scroll back on their device to try find some conversation whose outcome was never logged anywhere else. If you were lucky they had saved a screenshot, without context, of course.

This was even more difficult when dealing with clients or third party vendors, because they would have their own WeChat groups where they discussed support issues or purchases. I remember a situation where we had to contact a former employee to find a password to a machine because it had been shared on a chat that only they were on at the time - that sort of thing.

To be fair, I do think that a lot of similar stuff happens on Slack, where private groups get created and decisions are made without always including the correct participants according to the org chart. And probably prior to the explosion of workplace chat apps people were doing this by getting together in person for lunch or drinks or golf. It does make me feel a bit cynical about organizations that claim to hold values of transparency and accountability, though. It seems to me that cliques form regardless, and quietly influence direction regardless of any alleged corporate values.