Jet2 are a little different to Ryanair as they are flogging package tours and there enough people out there will to plan 2 years ahead, and part with a deposit to do so - it gives Jet2 much needed cashflow. I would suggest that Ryanair's market is rather different, with people booking short breaks and visiting second homes so early booking isn't quite such a factor.
All that said it is looking more and more likely that when Ryanair announces what's happening at EMA from January 2022 it will be either feast (major expansion) or famine (closing the base) and not somewhere in between. It looks very much as though there's some brinkmanship going on between MAG and Ryanair regarding EMA at the moment. No inside information, just me reading the tea leaves.