Provided you follow the rules - their rules - to the letter, that's half the battle.
The second point is that they are remarkably recalcitrant at resolving things when aspects go wrong that they are not fully in control of - be it adverse weather, French air traffic controllers, the Friday before a busy bank holiday, bomb alerts at airports, whatever.
So that's about not picking Ryanair flights when one can reasonably judge that there might be a problem ahead - OK so bombs alerts can't be forecast. But trying to fly into Geneva on a Friday afternoon in February is more likely to result in trouble flying Ryanair because they allow less margin for error - that's how the flights are cheap.
One never knows for sure about a future journey, but it is about mitigating your risk and if you can't do that, choose another carrier for the journey.