Looking good

The list as revealed so far sounds great.
I have a question on the new coaching system and how\when it will affect an imported game. I've imported my game every year, many times with the season in progress, without issue.
I'm wondering how the new coaching system will be handled if we import a season in progress?
Will teams immediately hire base coaches and whatever other coaches that have been added?
Will this be disabled until the start of the first full v22 season?
If one chose to could they play without the new coaches and simply use the current system? This is what I might do, if allowed, while finishing my current season and, then move into the new system in the offseason.
Thanks