SharePoint site owners can teamify (team-enable) their site, which is nice, Now you can create channel tabs based on site resources during the team enablement process. It’s a nice new feature but you must remember that a new team only has a General channel, so site resources will end up in a place where they might necessarily not end up in the long run.
Teams is removing system messages from the General channel in teams. System messages tell users about events like new members, but they’re really not that interesting, unless you’re fond of tracking the comings and goings of members, much like a noisy neighbor behind a curtain. Uncluttering the General channel is no reason to let it degrade, so keep it for important stuff and force conversations into other channels.