I'm sure someone will tell me to read the fine print, but I think it is a very misleading situation:

Two of my recent flights were booked on short notice (2 days before the flight). (NUE-BRU, and HAJ-LHR for what it matters). Costs of both flights were over 900 euros and the booking and receipt showed Y (i.e. full flexible eco) as the booking class/fare bucket.

To my surprised when I wanted to rebook one flight and cancel the other, I was told by the hotline that "these are special Y fares. Rebooking is fifty euros and they cannot be refunded"

Now I don't know about you, but when I book a shorthaul flight for close to 1000 euros, state specifically state a Y fare, I would assume that I get a full flexible product. Yes, I should have clicked on the fare details link when booking, but I find this highly annoying.
It actually puts the frequent traveller who automatically thinks "Y=fully flexible" at a disadvantage.
If LHRelate is reading this, I would like to see this more prominently visible when booking.