As G Suite admins will have seen in email…
Starting February 15, 2021, G Suite accounts will only allow access to apps using OAuth. Password-based access will no longer be supported.
And fortunately, this particular thing can get quickly discarded from the pile of stuff you gotta worry about. It’s specifically about any third-party apps that you have given permission to access any of your Google accounts. For example, when we set up Apple Mail, we have to grant access to our Google account, and that goes over this OAuth the above email references. Any modern app should be similar.
Even if there were some app that we’ve connected a while back under the old scheme, we would just update it and reconnect it when we run into it not working. IOW, I ain’t concerned about this for any of my peeps.