I don’t think the big ten makes that requirement because the future is unknown
Once the playoff format is finalized they can do that and not have to break as many future contracts.
If leagues get X auto bids the big ten will very quickly move to more conference games.
For instance. If the big ten gets 6 auto bids in playoff that has no at large bids: the big ten may move to 11 conference games.
If the big ten gets 5 auto bids in a playoff with a few at larges: the big ten will move to 10 conference games.
If it stays as currently formatted, they probably won’t add conference games