ReprievedSoul, you’re right it is not hard.
What is hard is asking staff with no empowerment to use empowerment to decide if a pax should travel without the correct ID.
If Ryanair has decided they want photo ID for travel, that is up to them.
Suppose a member of staff on the outward leg made a mistake and let on someone with the wrong ID……should that mean the poor sod now responsible for the return flight now exceed his/her authority by allowing someone to fly without the correct ID. I think not, low paid staff are rarely empowered to make decisions, and so ultimately the traveller is at fault for not following the terms and conditions of the ticket. That’s LoCo, I would expect a full service airline to have someone available that does have empowerment and to sort things out. I would expect the LoCo to not have the budget for such luxury, and that is why they got the ticket so cheap, because when it goes wrong, as they say in the Russian army……toughki shitski.